Add `QueryParams` type

[pederhan]

This PR replaces all bare dict annotations with a new QueryParams type. This type is more limited than JsonMapping, and does not allow dict, list and float values (maybe float should be allowed?).

Everywhere where we construct inline query param dicts has been rewritten to use this new type annotation. Furthermore, all explicit conversion of query param values to strings has been removed, since passing ints and None as query param values is valid.

As part of this PR, the Endpoint.with_query() method has been removed, since we delegate the construction of the query param string to the requests library instead of doing it ourselves.

Future work

APIMixin.get_by_field() and get_item_by_key_value() should be looked at to support integer values in addition to strings.

[pederhan]

Comparing* with #255, we get the following diff between the two new_testsuite_log.json files:

========================================================================
Command: network find -network <IPv4>/24 -description '*one host*' -vlan 1234 -frozen 1 -reserved 6 -dns_delegated 0 -category Yellow -location Somewhere        -expected, +tested
========================================================================
  [
      {
          "command": "network find -network <IPv4>/24 -description '*one host*' -vlan 1234 -frozen 1 -reserved 6 -dns_delegated 0 -category Yellow -location Somewhere",
          "command_filter": null,
          "command_filter_negate": false,
          "command_issued": "network find -network <IPv4>/24 -description '*one host*' -vlan 1234 -frozen 1 -reserved 6 -dns_delegated 0 -category Yellow -location Somewhere",
          "ok": [],
          "warning": [
              "No networks matching the query were found."
          ],
          "error": [],
          "output": [],
          "api_requests": [
              {
                  "method": "GET",
-                 "url": "/api/v1/networks/?network=<IPv4>/24&description__regex=.%2Aone%20host.%2A&vlan=1234&dns_delegated=0&category=Yellow&location=Somewhere&frozen=1&reserved=6",
?                                                         ^                             ^^^
+                 "url": "/api/v1/networks/?network=<IPv4>%2F24&description__regex=.%2Aone+host.%2A&vlan=1234&dns_delegated=0&category=Yellow&location=Somewhere&frozen=1&reserved=6",
?                                                         ^^^                             ^
                  "data": {},
                  "status": 200,
                  "response": {
                      "count": 0,
                      "next": null,
                      "previous": null,
                      "results": []
                  }
              }
          ],
          "time": null
      }
  ]

========================================================================
Command: host sshfp_add bar 1 1 12345678abcde        -expected, +tested
========================================================================
  [
      {
          "command": "host sshfp_add bar 1 1 12345678abcde",
          "command_filter": null,
          "command_filter_negate": false,
          "command_issued": "host sshfp_add bar 1 1 12345678abcde",
          "ok": [
              "Added SSHFP record for bar.example.org."
          ],
          "warning": [],
          "error": [],
          "output": [],
          "api_requests": [
              {
                  "method": "GET",
                  "url": "/api/v1/hosts/bar.example.org",
                  "data": {},
                  "status": 200,
                  "response": {
                      "ipaddresses": [
                          {
                              "macaddress": "",
                              "ipaddress": "<IPv4>",
                              "host": 14
                          },
                          {
                              "macaddress": "<IPv6>",
                              "ipaddress": "<IPv4>",
                              "host": 14
                          },
                          {
                              "macaddress": "",
                              "ipaddress": "<IPv6>",
                              "host": 14
                          }
                      ],
                      "cnames": [],
                      "mxs": [],
                      "txts": [
                          {
                              "txt": "v=spf1 -all",
                              "host": 14
                          }
                      ],
                      "ptr_overrides": [],
                      "hinfo": null,
                      "loc": null,
                      "bacnetid": null,
                      "name": "bar.example.org",
                      "contact": "me@example.org",
                      "ttl": null,
                      "comment": "This is the comment",
                      "zone": 1
                  }
              },
              {
                  "method": "GET",
                  "url": "/api/v1/sshfps/?algorithm=1&hash_type=1&fingerprint=12345678abcde&host=14",
                  "data": {},
                  "status": 200,
                  "response": {
                      "count": 0,
                      "next": null,
                      "previous": null,
                      "results": []
                  }
              },
              {
                  "method": "POST",
                  "url": "/api/v1/sshfps/",
                  "data": {
                      "algorithm": "1",
                      "hash_type": "1",
                      "fingerprint": "12345678abcde",
-                     "host": "14"
?                             -  -
+                     "host": 14
                  },
                  "status": 201,
                  "response": {
                      "ttl": null,
                      "algorithm": 1,
                      "hash_type": 1,
                      "fingerprint": "12345678abcde",
                      "host": 14
                  }
              }
          ],
          "time": null
      }
  ]

I have tested network find with spaces in descriptions, and I did not notice any differences in behavior between the two branches.

---

*I applied #271 as a patch when testing both branches to prevent extra noise from improperly escaped messages.