fix(Predictions): Fix Liveness InvalidSignatureException

[tylerjroach]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

We send video and client events over the liveness websocket. Video events and client events are sent from different threads. If a video and client event are sent at identical time, prior signatures may get mixed up, causing an invalid signature event. This approach uses a coroutine channel queue to ensure outbound websocket events are processed 1 at a time.

How did you test these changes?

Manual testing

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 7.81250% with 59 lines in your changes are missing coverage. Please review.

Project coverage is 42.92%. Comparing base (956ba11) to head (1b677a5).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2729      +/-   ##
==========================================
- Coverage   42.92%   42.92%   -0.01%     
==========================================
  Files         905      905              
  Lines       29115    29127      +12     
  Branches     4144     4144              
==========================================
+ Hits        12497    12502       +5     
- Misses      15261    15269       +8     
+ Partials     1357     1356       -1