Add support for M2M100EncoderModel (aka NLLB, aka SONAR text encoder) #2541
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This is a draft pull request for supporting SONAR text encoder model.
SONAR encoder is architecturally an encoder from NLLB, which is, in turn, is implemented as M2M100 in HF Transformers.
Thus, I support the encoder-only part of it, in the same way as T5-based encoders are currently supported.
This PR depends on a pull request to Transformers huggingface/transformers#29646, and should be reviewed only after that one.
Probably, the minimal required version of Transformers should also be updated to point to a release after the aforementioned PR is merged.