Update bitrate calculation scripts for the IS24 discrete speech challenge

[ftshijt]

Two scripts for bitrate calculation.

The calculate_bitrate.py is for processing the submission package (i.e., all submission from participants shall be able to use this one to compute)

The convert_token2json.py is for converting espnet baseline results into a submission package.

Please consider merging it in advance so @simpleoier can push the ASR side scoring and I update the TTS and SVS scoring.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.27%. Comparing base (3ad92c2) to head (1d3ede4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5677      +/-   ##
==========================================
- Coverage   76.11%   70.27%   -5.85%     
==========================================
  Files         747      746       -1     
  Lines       69409    69369      -40     
==========================================
- Hits        52834    48752    -4082     
- Misses      16575    20617    +4042     

Flag	Coverage Δ
test_configuration_espnet2	∅ <ø> (∅)
test_integration_espnet1	62.92% <ø> (ø)
test_integration_espnet2	?
test_python_espnet1	18.32% <ø> (ø)
test_python_espnet2	52.05% <ø> (-0.65%)	⬇️
test_utils	21.90% <ø> (-0.26%)	⬇️

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[sw005320]

OK, thanks.
Please also add the test for this function when you make a PR for scoring.

[sw005320]

I'm merged it assuming that the CI error is not related to this.