add connection info endpoint

Adds a new Endpoint system/connection-info that provides connection details for external apps like Zeus Wallet or others. @cstenglein this strings can be used to be displayed as QR code to then for example paar a mobile wallet.

So for example when running LND a result can look like this:

{
  "lnd_admin_macaroon": "0201036C6E6402F801030A10B9BC5746E0F52F441BE2BF3B75A1C1EC1201301A160A0761646472657373120472656164120577726974651A130A04696E666F120472656164120577726974651A170A08696E766F69636573120472656164120577726974651A210A086D616361726F6FD634804926E441E8C730F92AE0C10E5732EE20EB6D6DE",
  "lnd_invoice_macaroon": "0201036C6E640258030A10B7BC5746E0F52F441BE2BF3B75A1C1EC1201301A160A0761646472657373120472656164120577726974651A170A08696E766F6963657312047",
  "lnd_readonly_macaroon": "0201036C6E6402AC01030A10B8BC5746E0F52F441BE2BF3B75A1C1EC1201301A0F0A07616464726573731204726561641A0C0A04696E666F1204726561641A100A08696E766F696365731204726561641A100A086D616361726F6F6E1204726561641A0F0A076D6573736167651204726561641A100A086F6666636861696E1204726561641A0F0A076F6E636861696E1204726561641A0D0A0570656572731204726561641A0E0A067369676E65721204726561640000062065950AD6F3E7C234B5E76B9EC58838180AB9296F99D49F9C0396C9138",
  "lnd_rest_onion":"7hyube57cxcd47lcgrihujaevtsqlgd5ga34l637rgsyvd32x6.onion:8080",
  "lnd_tls_cert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
  "lnd_btcpay_connection_string": "",
  "lnd_zeus_connection_string": "lndconnect://7hyube57cxcd47lcgrihujaevtsqlgd5ga34l637rgsyvd32x6.onion:8080?macaroon=AgEDbG5kAvgBAwoQubxXRuD1L0Qb4r87daHB7BIBMBoWCgdhZGRyZXNzEgRyZWFkEgV3cml0ZRoTCgRpbmZvEgRyZWFkEgV3cml0ZRoXCghpbnZvaWNlcxIEcmVhZBIFd3JpdGUaIQoIbWFjYXJvb24SCGdlbmVyYXRlEgRyZWFkEgV3cml0ZRoWCgdtZXNzYWdlEgRyZWFkEgV3cml0ZRoXCghvZmZjaGFgoHb25jaGFpbhIEcmVhZBIFd3JpdGUaFAoFcGVlcnMSBHJlYWQSBXdyaXRlGhgKBnNpZ25lchIIZ2VuZXJhdGUSBHJlYWQAAAYg0JENEUVinuZ2_WNIBJJuRB6Mcw-SrgwQ5XMu4g621t4&cert=MIICCjCCAbCgAwIBAgIQVPRBsMUoM7D52cEtv-fqijAKBggqhkjOPQQDAjA1MR8wHQYDVQQKExZsbmQgYXV0b2dlbmVyYXRlZCBjZXJ0MRIwEAYDVQQDEwlsb2NhbGhvc3QwHhcNMjEwODI3MTk0MzQwWhcNMjIxMDIyMTk0MzQwWjA1MR8wHQYDVQQKExZsbmQgYXV0b2dlbmVyYXRlZCBjZXJ0MRIwEAYDVQQDEwlsb2NhbGhvc3QwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQ-JBVL664HLX4oOxH_SLpZaXD70X1GEBoBSAI_1w7-5McXUiOnUERy0ARFA0N6m5NKfkP-4a0XnyVo4GhMIGeMwICpDATBgNVHSUEDDAKBggrBgEFBQcDATAPBgNVHRMBAf8EBTADAQH_MB0GA1UdDgQWBBQ9FhnK1QrVpVp4NhtjJf25gXBbhzBHBgNVHREEQDA-gglsb2NhbGhvc3SCBHVuaXiCCnVuaXhwYWNrZXSCB2J1ZmNvbm6HBH8AAAGHEAAAAAAAAAAAAAAAAAAAAAEwCgYIKoZIzj0EAwIDSAAwRQIhAJrm3xdxPLstD8_FkaUJhSHF7Sutz-4GvRJQ_czHv2h6AiA86wbwGx_LbJPtqcBGnw69blsPzfFIo",
  "cl_rest_zeus_connection_string": "",
  "cl_rest_macaroon": "",
  "cl_rest_onion": ""
}

So for example when running Core Lightning a result can look like this:

{
  "lnd_admin_macaroon": "",
  "lnd_invoice_macaroon": "",
  "lnd_readonly_macaroon": "",
  "lnd_tls_cert": "",
  "lnd_btcpay_connection_string": "",
  "lnd_zeus_connection_string": "",
  "cl_rest_zeus_connection_string": "lndconnect://d22y5z6mcvu3rwuenwle57pddng3l7pzkromquy6k3qw6gwmfh7z2.onion:443?macaroon=02010b632d6c696768746e696e67023753756e2041707220303320323032322032323a32343a353720474d542b303130302028427269746973682053756d6d652054696d652900000620f10755bc9f21fc4a20d927505c78b28bd8a4d35d93eb548fa8af1b80a1626b",
  "cl_rest_macaroon": "02010b632d6c696768746e696e670237556e2041707220303320323032322032323a32343a353720474d542b303130302028427269746973682053756d6d65722054696d652900000620f10755bc9f21fc4a20d927505c78b28b46d8a4d35d93eb548fa8af1b80a1626b",
  "cl_rest_onion": "d22y5z6mcvu3rwuenwle57pdd3l7pzkromquy6k3qw6gwmfh7z2.onion:443"
}

fusion44 / blitz_api

add connection info endpoint #86