Add plot() functionality to audio metrics

[shhs29]

What does this PR do?

Fixes #1406

Currently, plot functionality is added for pesq metric. The test for plotting passes locally. However, the workflows on CI are failing.

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[Borda]

@SkafteNicki @justusschock mind have look 🦦

[shhs29]

Hi @shhs29, I looked through your PR and fixed the problems with the tests (a missing installation in the CI was the main problem). Can you add for the remaining audio metrics and then we can get this merged? :) Thanks for your work.

@SkafteNicki Thanks a lot for the help. I will add plot functionality for other audio metrics and make it available soon.

No problem. Just tag me when you are done with the rest and I can help cleanup and fix anything that may be missing/fails :]

@SkafteNicki I have added plot functionality for all the audio metrics. However, I am unsure about the lower and upper bounds of these metrics. Also, a couple of Github actions are failing, which I suspect is due to some incorrect/insufficient imports. I would appreciate your feedback on the same.

[SkafteNicki]

@shhs29 thanks, I will take a look at it soon. We are experience problems with our CI at the moment, which should hopefully be solved soon also.