[XLSR-Wav2Vec2] Add multi-lingual Wav2Vec2 models (#10648)
* add conversion script
* add wav2vec2 xslr models
* finish
* Update docs/source/model_doc/xlsr_wav2vec2.rst
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
