Several improvements to wav2vec2aligner system: early errors, testing, py 3.8 compatibility, etc

[joanise]

See EveryVoiceTTS/wav2vec2aligner#14

Plus activate its testing in the main Everyvoice unit testing.

Fixes #326
And more

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
everyvoice/run_tests.py	19% smaller
.github/workflows/test.yml	Unsupported file format
everyvoice/model/aligner/wav2vec2aligner	0% smaller

[github-actions]

CLI load time: 0:00.29
Pull Request HEAD: 727e4f319c899508223d0a1c5a7461c7f7e7ba73
Imports that take more than 0.1 s:
import time: self [us] | cumulative | imported package
import time:       253 |     107607 |   typer
import time:      6412 |     224288 | everyvoice.cli

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.58%. Comparing base (e359342) to head (727e4f3).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #590   +/-   ##
=======================================
  Coverage   76.58%   76.58%           
=======================================
  Files          46       46           
  Lines        3451     3451           
  Branches      470      470           
=======================================
  Hits         2643     2643           
  Misses        706      706           
  Partials      102      102           

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