[BLOOM] Deprecate `position_ids`
# What does this PR do?

Deprecate `position_ids` as they never made sense for BLOOM.

_The documentation is not available anymore as the PR was closed or merged._<|||||>With @NouamaneTazi we discovered that this actually breaks scripting for torch 1.11 (and seems to work fine in torch 1.12) . In particular, the `**` operator breaks it,  should we revert back to set `position_ids=None` in the signature of the function? cc @sgugger 

> your solution works against everything :-)

I guess it didn't ...<|||||>Does this mean `torchscript` can't work with `**kwargs`?<|||||>No it didn't work with kwargs, that's why it doesn't work for some specific models like XLNet. Since this seems fixed in PyTorch 1.12 and torchscripting is not the mainstream use, I would leave it as is (so users need to use PyTorch >= 1.12 for scripting).