[SVS] Extend SingingGenerate

[A-Quarter-Mile]

Hi @ftshijt, here are updates on Muskits:

• Add stage 10 & 11 for uploading model
• Supporting SingingGenerate like Text2Speech

[codecov]

Codecov Report

Merging #5100 (272b5c3) into master (c75542c) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5100      +/-   ##
==========================================
- Coverage   75.89%   75.85%   -0.05%     
==========================================
  Files         615      615              
  Lines       54824    54858      +34     
==========================================
  Hits        41610    41610              
- Misses      13214    13248      +34     

Flag	Coverage Δ
test_integration_espnet1	66.29% <ø> (ø)
test_integration_espnet2	48.44% <0.00%> (ø)
test_python	65.83% <0.00%> (-0.05%)	⬇️
test_utils	23.28% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
espnet2/bin/svs_inference.py	0.00% <0.00%> (ø)
espnet2/train/preprocessor.py	29.37% <0.00%> (ø)

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[ftshijt]

Many thanks!