add ONNX support for BLOOM (#17961)
* add onnx support for BLOOM
* use TYPE_CHECKING for type annotations
* fix past_shape for bloom (different from gpt2)
* use logical_or instead of `+` for onnx support
* bigger `atol_for_validation` for larger bloom models
* copied -> taken because it's no longer an exact copy
* remove "copied from" comment
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
