AudioClassificationData from_numpy and from_tensors

[ethanwharris]

…ile types

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #745 (f3e8aab) into master (75afa79) will decrease coverage by 0.00%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #745      +/-   ##
==========================================
- Coverage   89.65%   89.65%   -0.01%     
==========================================
  Files         198      198              
  Lines       10667    10681      +14     
==========================================
+ Hits         9564     9576      +12     
- Misses       1103     1105       +2     

Flag	Coverage Δ
unittests	89.65% <83.33%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/audio/classification/transforms.py	86.95% <66.66%> (-13.05%)	⬇️
flash/audio/classification/data.py	95.74% <100.00%> (+3.43%)	⬆️
flash/image/data.py	95.45% <100.00%> (ø)

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[tchaton]

LGTM !