[SVS] Updates for recipes

[A-Quarter-Mile]

Hi @ftshijt, here are updates on Muskit.

• Add new recipe Natsume for SVS.
• Add MIDI_reader in fileio/.
• Provide instructions on score preparation for new recipe in ReadMe.md. The details can be found in the comments of codes. Case 2 is left to be updated.

[codecov]

Codecov Report

Merging #5187 (c445c5c) into master (f4d7fea) will increase coverage by 0.03%.
The diff coverage is 63.15%.

@@            Coverage Diff             @@
##           master    #5187      +/-   ##
==========================================
+ Coverage   75.00%   75.04%   +0.03%     
==========================================
  Files         630      630              
  Lines       56821    56872      +51     
==========================================
+ Hits        42619    42679      +60     
+ Misses      14202    14193       -9     

Flag	Coverage Δ
test_integration_espnet1	66.28% <ø> (ø)
test_integration_espnet2	47.58% <24.39%> (-0.03%)	⬇️
test_python	65.71% <63.15%> (+0.04%)	⬆️
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/svs/espnet_model.py	6.78% <0.00%> (-0.23%)	⬇️
espnet2/tasks/svs.py	46.47% <28.57%> (-0.49%)	⬇️
espnet2/fileio/score_scp.py	66.66% <82.92%> (+6.04%)	⬆️

... and 6 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[ftshijt]

Many thanks for the update! I will merge it after verifying the CI has passed.

[ftshijt]

Many thanks for your contribution!