add ASR evaluation for long speech

[wyh2000]

What?

Add evaluation scripts for long speech ASR.

Why?

For long speech (e.g. longer than 20 seconds), we should first split it into shorter segments and then evaluate ASR performance. In this PR, we added code to split the speech based on the threshold.

See also

VoxtLM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.10%. Comparing base (d004740) to head (85212a5).

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5696       +/-   ##
===========================================
+ Coverage   23.30%   70.10%   +46.80%     
===========================================
  Files         746      746               
  Lines       69369    69369               
===========================================
+ Hits        16163    48634    +32471     
+ Misses      53206    20735    -32471     

Flag	Coverage Δ
test_configuration_espnet2	?
test_integration_espnet1	62.92% <ø> (ø)
test_python_espnet1	18.32% <ø> (ø)
test_python_espnet2	52.05% <ø> (?)

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