Lazy import audio

[SkafteNicki]

What does this PR do?

Fixes part of #2171

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• Did you make sure to update the docs?
• Did you write any new necessary tests?

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📚 Documentation preview 📚: https://torchmetrics--2181.org.readthedocs.build/en/2181/

[codecov]

Codecov Report

Merging #2181 (c44032f) into master (09bd064) will decrease coverage by 51%.
Report is 5 commits behind head on master.
The diff coverage is 91%.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #2181     +/-   ##
========================================
- Coverage      87%     36%    -51%     
========================================
  Files         293     293             
  Lines       16410   16402      -8     
========================================
- Hits        14256    5847   -8409     
- Misses       2154   10555   +8401