Add transformer results for LibriSpeech 100h

[pyf98]

Hi, here is the Transformer baseline for LibriSpeech 100h. The Transformer encoder has 18 layers. As expected, the performance of Transformer is worse than that of Conformer.

[codecov]

Codecov Report

Merging #4089 (da026d8) into master (29ab726) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4089   +/-   ##
=======================================
  Coverage   80.94%   80.94%           
=======================================
  Files         435      435           
  Lines       37429    37429           
=======================================
  Hits        30297    30297           
  Misses       7132     7132           

Flag	Coverage Δ
test_integration_espnet1	67.13% <ø> (ø)
test_integration_espnet2	52.44% <ø> (ø)
test_python	66.61% <ø> (ø)
test_utils	24.45% <ø> (ø)

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[sw005320]

Thanks, @pyf98!