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Move the computation of `#classes -> #bits` to the constructor of WaveRNN and attach it to the instance, so that it can be reused elsewhere.

- TorchScript-able `Wav2Vec2Model` class
- Factory functions for three configurations presented in the paper 
  - `wav2vec2_base`
  - `wav2vec2_large`
  - `wav2vec2_large_lv60k`

Co-authored-by: Vincent Quenneville-Belair <vincentqb@gmail.com>

* remove * in import of models.

* only importing WaveRNN in tests.

We have been running unit test with editable installation. (i.e. `python setup.py develop`), with which we missed issues like #842. 

This CC makes installation in CI non-editable, and change test directory structure so that the source code will not shadow the installed version of `torchaudio`. With simple `pytest test`, `pytest` modifies `sys.path` and prepend checked out repository, which shadows the installed version.

To remedy this, the whole test suites has been moved from `./test` to `./test/torchaudio_unittest`. This adds nice module structure to our test code and we can do absolute import in each test module, which makes it possible again to run test with `python -m unittest torchaudio_unittest/XXX.py`

This change does not affect the regular development process (`python setup.py develop` && `pytest test`)

* Remove underscore of model name
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Change the name of  n_output and n_hidden

* Replace the mode by n_classes and sample_rate

* Change the definition of n_output and n_hidden
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* upsamplenetwork

* update variable names

* update variable name

* add wavernn model

* update test

* update format

* update format

* update format

* fix conflicts and add transpose

* import update

* update transpose

* update format

* update docstring

* add n_channel in input

* add comment

* update docstring

* update docstring
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* upsamplenetwork

* update name

* update name and docstring

* update format

* rebase

* update docstring

* update docstring

* remove transpose and update docstring
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* update varible names and docstring

* update format

* update docsting and output value
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* add unittest in test_models

* update test method

* remove unittest main function
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Add MelResNet Block

* add default value

* update model and test

* rebase and small changes

* add pad variable

* update format

* update reference in docstrings

* add underscore name
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* add wav2letter model

* add unit_test to model

* add docstrings

* add documentation

* fix minor error, change logic on forward

* update padding same with ceil

* add inline typing and minor fixes to docstrings

* remove python2

* add formula do docstrings, change param name

* add test with mfcc, add pytest

* fix bug, update docstrings

* change parameter name