Add type hints for XLM TensorFlow
# What does this PR do?
This PR adds type hints to the XLM model for TensorFlow.

Models:

- albert, bert, xlm: @LysandreJik


The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_16223). All of your documentation changes will be reflected on that endpoint.