feat: add offline-ras synthesize output format

[joanise]

PR Goal?

Add the ability to synthesize directly to readalong's Offline HTML format.

Fixes?

Enhancement to #102 to complete fixing EveryVoiceTTS/EveryVoice#439

Feedback sought?

test, and review code

Priority?

beta

Tests added?

yes

How to test?

everyvoice synthesize from-text  -O offline-ras -t "stuff and nonsense" -v <vocoder.cpkt> <fs2.ckpt>

and look at the synthesized readalong/*.html file.

"forget" the -v option and see a nice error message

Confidence?

pretty good

Version change?

it'll contribute to the minor we're working on.

Related PRs?

Coming soon to a PR near you...
EveryVoiceTTS/EveryVoice#608
ReadAlongs/Studio#256

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
fs2/cli/synthesize.py	74% smaller
fs2/type_definitions.py	60% smaller
fs2/tests/test_writing_callbacks.py	20% smaller
fs2/prediction_writing_callback.py	18% smaller

[roedoejet]

Looks good to me, @joanise - thanks! I would request changing the offline-ras variable name to something with more continuity with the existing readalong output type. Either with both readalong-xml and readalong-html or just readalong for the html/offline and readalong-xml.

[codecov]

Codecov Report

Attention: Patch coverage is 97.05882% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.97%. Comparing base (9549082) to head (ff1b0d0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
fs2/prediction_writing_callback.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   46.13%   46.97%   +0.83%     
==========================================
  Files          22       22              
  Lines        1461     1486      +25     
==========================================
+ Hits          674      698      +24     
- Misses        787      788       +1     

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[roedoejet]

awesome thanks!