feat: add pc-ddsp, bigvgan and refactor a lot

[34j]

No description provided.

[codecov-commenter]

Codecov Report

Merging #340 (cc07bff) into main (4aad701) will decrease coverage by 3.69%.
The diff coverage is 4.09%.

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@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
- Coverage   20.34%   16.65%   -3.69%     
==========================================
  Files          38       48      +10     
  Lines        3294     4070     +776     
  Branches      430      529      +99     
==========================================
+ Hits          670      678       +8     
- Misses       2607     3382     +775     
+ Partials       17       10       -7     

Impacted Files	Coverage Δ
src/so_vits_svc_fork/dataset.py	31.37% <0.00%> (-0.63%)	⬇️
src/so_vits_svc_fork/inference/core.py	18.85% <ø> (ø)
...vits_svc_fork/modules/decoders/bigvgan/__init__.py	0.00% <0.00%> (ø)
..._svc_fork/modules/decoders/bigvgan/_activations.py	0.00% <0.00%> (ø)
..._vits_svc_fork/modules/decoders/bigvgan/_models.py	0.00% <0.00%> (ø)
...o_vits_svc_fork/modules/decoders/bigvgan/_utils.py	0.00% <0.00%> (ø)
...vits_svc_fork/modules/decoders/pc_ddsp/__init__.py	0.00% <0.00%> (ø)
...so_vits_svc_fork/modules/decoders/pc_ddsp/_core.py	0.00% <0.00%> (ø)
...so_vits_svc_fork/modules/decoders/pc_ddsp/_loss.py	0.00% <0.00%> (ø)
...o_vits_svc_fork/modules/decoders/pc_ddsp/_pcmer.py	0.00% <0.00%> (ø)
... and 12 more

... and 6 files with indirect coverage changes

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[34j]

https://github.com/NVIDIA/BigVGAN/blob/main/configs/bigvgan_base_22khz_80band.json