feat/converse_session

[NeonJarbas]

adds the concept of Session to converse pipeline, refactors converse and get_response to be event based and per session, requires OpenVoiceOS/OVOS-workshop#68

see session implementation here https://github.com/OpenVoiceOS/ovos-bus-client/blob/dev/ovos_bus_client/session.py

a session can be a user, a client device, or anything else providing utterances to core. immediate applications are in neon multi user setup (each klat user has a session) and in hivemind (each client has a session)

[NeonDaniel]

Would it make sense to have context like:

context:
  session:
    id:

This lets the client include any other session data like timestamps, active/inactive, voice vs text, and anything else the client might care about

[NeonDaniel]

The bus client refactor could probably be a PR on its own to get it in immediately for testing

[JarbasAl]

The bus client refactor could probably be a PR on its own to get it in immediately for testing

the session utils are a little different, this also replaces the mycroft.session module so it made sense to do it all together.

splitting PRs could be a problem, we will be getting a session object that is not actually managed, the calls to the new util get lang_from_message will also account for this new session object. I don't immediately see an issue there, but i feel this should all be tested together. this PR will need a lot more unittests too

[JarbasAl]

actually leave this open and I will rebase on top of #292

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6ceb058) 50.35% compared to head (8d78d08) 44.28%.
Report is 416 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #160      +/-   ##
==========================================
- Coverage   50.35%   44.28%   -6.08%     
==========================================
  Files         119       13     -106     
  Lines       10077     1827    -8250     
==========================================
- Hits         5074      809    -4265     
+ Misses       5003     1018    -3985     

see 95 files with indirect coverage changes

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