[StyleTTS2] feat: add demo and inference integration basics

[roedoejet]

PR Goal?

I previously connected the everyvoice train functionality with StyleTTS2. This PR integrates StyleTTS2 with everyvoice demo, everyvoice synthesize, and everyvoice checkpoint inspect commands.

Fixes?

Part of #686

Feedback sought?

Testing, but also sanity. I think there are actually quite a few places where we tied ourselves a bit too closely to FS2 and its architecture. I think I need some space to be able to tell how to refactor, but any insight is helpful.

I'm mostly looking for high-level analysis about whether the approach to combine repos in this way is reasonable.

Priority?

high

Tests added?

none so far

How to test?

try running everyvoice synthesize, everyvoice demo, and everyvoice checkpoint inspect. note, that I don't think this will work on the model you just trained. I'm not adding backwards compatibility support for that, although the hooks are in place for us to be able to handle this in the future in the same way as FS2

Confidence?

medium

Version change?

n/a, already bumped to 0.5.0

Related PRs?

EveryVoiceTTS/FastSpeech2_lightning#142
EveryVoiceTTS/StyleTTS2#4

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
everyvoice/tests/test_cli.py	68% smaller
everyvoice/cli.py	2% smaller
everyvoice/base_cli/checkpoint.py	0% smaller
everyvoice/base_cli/prediction_writing_callback.py	0% smaller
everyvoice/demo/app.py	0% smaller
everyvoice/model/e2e/StyleTTS2_lightning	0% smaller
everyvoice/model/feature_prediction/FastSpeech2_lightning	0% smaller

[github-actions]

CLI load time: 0:00.33
Pull Request HEAD: 2e00485f3a563c5217027735d582a2cda711d7af

Imports that take more than 0.1 s:
import time: self [us] | cumulative | imported package
import time:      1575 |     161770 | everyvoice.cli

[codecov]

Codecov Report

❌ Patch coverage is 18.78788% with 134 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.81%. Comparing base (f62801e) to head (2e00485).

Files with missing lines	Patch %	Lines
everyvoice/demo/app.py	3.70%	78 Missing ⚠️
everyvoice/cli.py	13.33%	52 Missing ⚠️
everyvoice/base_cli/checkpoint.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #804      +/-   ##
==========================================
- Coverage   87.53%   84.81%   -2.72%     
==========================================
  Files          45       46       +1     
  Lines        4026     4189     +163     
  Branches      603      626      +23     
==========================================
+ Hits         3524     3553      +29     
- Misses        365      499     +134     
  Partials      137      137              

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