speech recognition auto processor

[flozi00]

What does this PR do?

This PR replaces the static wav2vec2 processor with the autoprocessor class.
Furthermore it's now possible to train pretrained only model without pretrained processor by defining the processor seperately.

Fixes # (issue)

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[codecov]

Codecov Report

Merging #1075 (e98b7fb) into master (6f3dc08) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1075   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files         281      281           
  Lines       12804    12804           
=======================================
  Hits        11220    11220           
  Misses       1584     1584           

Flag	Coverage Δ
unittests	87.62% <100.00%> (ø)

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Impacted Files	Coverage Δ
flash/audio/speech_recognition/model.py	100.00% <100.00%> (ø)

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[ethanwharris]

Nice! Mind also updating the CHANGELOG?

[flozi00]

I am not sure what to do with the failing macos test, any advice ?

[ethanwharris]

@flozi00 Just a flaky test, no need to worry about it. Will merge your PR now 😃