Add abstractions to make it easier to declare and instantiate models

[NickleDave]

Fixes

• Engine + core/cli re-design #359
• make it easier to instantiate a model #362
• add a ModelDefinition class #406
• ENH: change how Model is declared to remove sub-classing of vak.engine.Model #536
• ENH: Add built-in TweetyNet model #596
• ENH: Add abstraction that represents family of models that classify frames / time bins from spectrogram windows #603

See discussion in those issues

[NickleDave]

Still need to add tests for new classes, but current tests pass

[NickleDave]

This should probably also include a very initial version of #37 that at least documents how these abstractions work, taken from my dev notes

• vignette: adding a WindowedFrameClassificationModel
• reference: abstractions for models, base class + decorator; goals and design decisions

[NickleDave]

@yardencsGitHub tests for this now pass locally 😩

I found a way to make the abstractions a little more succinct than when we talked through it. Basically, there's just a single decorator @model that just modifies a ModelDefinition in place to convert it into a model class that sub-classes a model family.

Assuming tests pass on CI, I will go ahead and merge in.

In the future let's do more async review, but I would really like to make progress on version 1.0 while I have a little time to focus on it.

[NickleDave]

I am not understanding why the CI is failing.

I think it may be related to this?
actions/runner-images#6931

I also thought it might be an old version of generated test data on the OSF repo but I tried downloading the generated data for ci locally and then running the tests the same way we do on CI, but this did not reproduce the error--the tests are running fine without failure

It's also weird we get specific test failures but no error messages at the end:

2023-01-22T00:58:43.9564606Z nox > pytest --models teenytweetynet --cov=./ --cov-report=xml
2023-01-22T00:58:55.3302457Z ============================= test session starts ==============================
2023-01-22T00:58:55.3303545Z platform linux -- Python 3.9.16, pytest-7.2.1, pluggy-1.0.0
...
2023-01-22T01:14:45.8300540Z tests/test_core/test_predict.py FFFF.....   
...
2023-01-22T01:52:59.9927859Z tests/test_models/test_base.py ......................FF.....             [ 91%]
2023-01-22T01:53:00.0228373Z tests/test_models/test_decorator.py ..............                       [ 92%]
2023-01-22T01:53:00.0666356Z tests/test_models/test_definition.py ....................                [ 93%]
2023-01-22T01:53:00.3391652Z tests/test_models/test_teenytweetynet.py ..............                  [ 94%]
2023-01-22T01:53:00.3856049Z tests/test_models/test_tweetynet.py ..s                                  [ 94%]
2023-01-22T01:53:00.8246889Z tests/test_models/test_windowed_frame_classification_model.py .......... [ 95%]
2023-01-22T01:53:01.9587868Z ...............F  
...

Just going to go ahead and merge