Style change 2.0

[desh2608]

This is a corrected version of #690.

• (107df3b) First pass: We apply black formatting without the --experimental-string-processing feature which was causing some files to get deleted entirely.
• (d31db01) Second pass: I manually went through all the modifications and corrected several of the sort:

            f"expected sample rate: {expected_sample_rate}. "
            f"Given: {sample_rate}"

being converted to:

           f"expected sample rate: {expected_sample_rate}. " f"Given: {sample_rate}"

and a small number of cases where inline comments made the formatting weird.

At the very least, these changes should not cause anything to break. If there is something I missed, I am hoping they can be corrected as people come across them in the future.

[desh2608]

@csukuangfj I would request you to please briefly check the files in the main icefall/ directory since they are used in all recipes, to ensure there are no breaking changes. (You can skip the changes in egs)

[csukuangfj]

Could you also update
https://github.com/k2-fsa/icefall/blob/master/docs/source/contributing/code-style.rst

[desh2608]

Done!

[csukuangfj]

Thanks! Looks good to me. Left a minor comment.

[desh2608]

Thanks! Looks good to me. Left a minor comment.

I think it's ready for merge?