Add restrictions on file extensions

[XXXXRT666]

errors won't occur due to .DS_Store files.

[SapphireLab]

Why not define AUDIO_EXTENSION in a single config file such as tools/my_utils.py and use from xxx import AUDIO_EXTENSION for reusability? It will be easier when adding new extensions or doing some modifications.
The PR might be of some use (

[XXXXRT666]

Some of them have no try or try outside the loop, so the the code will stop running after raising the error

[RVC-Boss]

@XXXXRT666
1、
→_→
2、这个音频文件格式列表全吗？
3、你要写成set而不是list，可以学习一下in list和in set的算法复杂度

[XXXXRT666]

现在应该就涵盖了99%能见到的扩展名了，要是直接把ffmepg的支持D的搬过来也行，已经改成set了