feat: parametrized timeout on KytosEventBuffer.put and exposing buffers queue size config

[viniarck]

Closes #423

This PR is on top of #438 since it depends on event_buffer_conf.

Summary

See updated changelog file (it also explains how to use it)

Local Tests

• I ran kytosd with my local env, still worked as it used to.

• I've also explored configurations on kytos.conf it's behaving as expected

• I then simulated a NApp misbehaving by sending too many events during setup() with mef_eline. Notice below that you can see exactly which producer couldn't put the event anymore, and then in the tracebacks it also includes who may events it had, which other events ended up filling the queue, in this case `kytos/mef_eline.xyz' had more than a 1000:

Full KytosEventBuffers counters: {'app': Counter({'kytos/mef_eline.xyz': 1003, 'kytos/topology.port.created': 19, 'kytos/topology.topology_loaded': 1, 'kytos/mef_eline.evcs_loaded': 1})

Kytos couldn't start because of KytosNAppSetupException: NApp kytos/mef_eline exception   Traceback (most recent call last):
  File "/home/viniarck/repos/kytos/kytos/core/controller.py", line 817, in load_napp
    napp = napp_module.Main(controller=self)
  File "/home/viniarck/repos/kytos/kytos/core/napps/base.py", line 194, in __init__
    self.setup()
  File "/home/viniarck/repos/napps/napps/kytos/mef_eline/main.py", line 72, in setup
    self.send_events(1024)
  File "/home/viniarck/repos/napps/napps/kytos/mef_eline/main.py", line 76, in send_events
    self.controller.buffers.app.put(KytosEvent("kytos/mef_eline.xyz"), timeout=1)
  File "/home/viniarck/repos/kytos/kytos/core/buffers/buffers.py", line 40, in put
    self._queue.sync_q.put(event, timeout=timeout)
  File "/home/viniarck/repos/kytos/.direnv/python-3.9/lib/python3.9/site-packages/janus/__init__.py", line 388, in put
    raise SyncQueueFull
queue.Full

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/viniarck/repos/kytos/kytos/core/controller.py", line 263, in start
    self.start_controller()
  File "/home/viniarck/repos/kytos/kytos/core/controller.py", line 360, in start_controller
    self.load_napps()
  File "/home/viniarck/repos/kytos/kytos/core/controller.py", line 852, in load_napps
    self.load_napp(napp.username, napp.name)
  File "/home/viniarck/repos/kytos/kytos/core/controller.py", line 820, in load_napp
    raise KytosNAppSetupException(msg) from exc
kytos.core.exceptions.KytosNAppSetupException: KytosNAppSetupException: NApp kytos/mef_eline exception  

Full KytosEventBuffers counters: {'app': Counter({'kytos/mef_eline.xyz': 1003, 'kytos/topology.port.created': 19, 'kytos/topology.topology_loaded': 1, 'kytos/mef_eline.evcs_loaded': 1})
}
Shutting down Kytos...
[1]    36965 terminated  kytosd -f -n /home/viniarck/repos/napps/napps -E --database mongodb

End-to-End Tests

I'll dispatch e2e execution with this branch and the other NApps PR which are using timeout=1 when putting events during setup():

+ python3 -m pytest tests/ --reruns 2 -r fEr
============================= test session starts ==============================
platform linux -- Python 3.9.2, pytest-7.2.0, pluggy-1.3.0
rootdir: /builds/amlight/kytos-end-to-end-tester/kytos-end-to-end-tests
plugins: rerunfailures-10.2, timeout-2.1.0, anyio-3.6.2
collected 255 items
tests/test_e2e_01_kytos_startup.py ..                                    [  0%]
tests/test_e2e_05_topology.py ...................                        [  8%]
tests/test_e2e_10_mef_eline.py ..........ss.....x.....x................  [ 23%]
tests/test_e2e_11_mef_eline.py ......                                    [ 26%]
tests/test_e2e_12_mef_eline.py .....Xx.                                  [ 29%]
tests/test_e2e_13_mef_eline.py ....Xs.s.....Xs.s.XXxX.xxxx..X........... [ 45%]
.                                                                        [ 45%]
tests/test_e2e_14_mef_eline.py x                                         [ 46%]
tests/test_e2e_15_mef_eline.py .....                                     [ 48%]
tests/test_e2e_20_flow_manager.py .....................                  [ 56%]
tests/test_e2e_21_flow_manager.py ...                                    [ 57%]
tests/test_e2e_22_flow_manager.py ...............                        [ 63%]
tests/test_e2e_23_flow_manager.py ..............                         [ 69%]
tests/test_e2e_30_of_lldp.py ....                                        [ 70%]
tests/test_e2e_31_of_lldp.py ...                                         [ 71%]
tests/test_e2e_32_of_lldp.py ...                                         [ 72%]
tests/test_e2e_40_sdntrace.py ..............                             [ 78%]
tests/test_e2e_41_kytos_auth.py ........                                 [ 81%]
tests/test_e2e_42_sdntrace.py ..                                         [ 82%]
tests/test_e2e_50_maintenance.py ........................                [ 91%]
tests/test_e2e_60_of_multi_table.py .....                                [ 93%]
tests/test_e2e_70_kytos_stats.py ........                                [ 96%]
tests/test_e2e_80_pathfinder.py ss......                                 [100%]
=============================== warnings summary ===============================
../../../../usr/local/lib/python3.9/dist-packages/kytos/core/config.py:235
------------------------------- start/stop times -------------------------------
= 231 passed, 8 skipped, 9 xfailed, 7 xpassed, 1109 warnings in 12224.88s (3:23:44) =