[SVS] Update XiaoiceSing

[A-Quarter-Mile]

Hi @ftshijt, here are updates on Muskits:

• Add slur in svs
• Add pitch_loss and vuv_loss for XiaoiceSing following XiaoiceSing2.

[codecov]

Codecov Report

Merging #5124 (9b23beb) into master (fc37f80) will decrease coverage by 0.12%.
The diff coverage is 8.84%.

@@            Coverage Diff             @@
##           master    #5124      +/-   ##
==========================================
- Coverage   75.10%   74.98%   -0.12%     
==========================================
  Files         616      617       +1     
  Lines       55051    55176     +125     
==========================================
+ Hits        41348    41376      +28     
- Misses      13703    13800      +97     

Flag	Coverage Δ
test_integration_espnet1	66.28% <ø> (ø)
test_integration_espnet2	47.75% <0.00%> (-0.02%)	⬇️
test_python	65.37% <8.84%> (-0.10%)	⬇️
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/gan_svs/espnet_model.py	0.00% <0.00%> (ø)
espnet2/gan_svs/joint/joint_score2wav.py	19.44% <ø> (ø)
espnet2/gan_svs/vits/vits.py	91.61% <ø> (ø)
espnet2/svs/espnet_model.py	7.56% <0.00%> (-0.25%)	⬇️
espnet2/svs/naive_rnn/naive_rnn.py	11.69% <ø> (ø)
espnet2/svs/naive_rnn/naive_rnn_dp.py	10.92% <ø> (ø)
espnet2/train/preprocessor.py	29.09% <0.00%> (-0.29%)	⬇️
espnet2/svs/xiaoice/XiaoiceSing.py	10.77% <2.56%> (-1.17%)	⬇️
espnet2/svs/xiaoice/loss.py	16.66% <16.66%> (ø)

... and 11 files with indirect coverage changes

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[ftshijt]

LGTM! please check the vuv part to make sure it is correct