feat: addons for FP8 attention bmm, paged attention, and linear in FMS

[ani300]

Description of the change

This is an updated version of @andrea-fasoli 's refactor of my FP8 work, adding Paged Attention kernels as well as cleaning the code.

Related issues or PRs

#149

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Code review (including math) is required.

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• I have ensured all unit tests pass

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[andrea-fasoli]

this PR needs minimal changes and in my opinion it is good to go. FP8 addons are an experimental feature which may require further validation of math and model outputs, but they don't interact with other parts of FMS-MO, so won't break existing code. Only exception is the additional import of torchao, only needed for fp8, which is being added to the build as optional requirement. @tharapalanivel @chichun-charlie-liu please check that this is done appropriately.

@ani300 we have barebone unit tests for other addons, that check op registration in the torch namespace and output shape validation: https://github.com/foundation-model-stack/fms-model-optimizer/blob/main/tests/aiu_addons/test_gptq_addon.py
Could we add the same for FP8? They are very basic, we have plans to expand them for full output validation against expectations, but for now something like this will do.

[andrea-fasoli]

this PR looks ready to go

[BrandonGroth]

Now that ibm-fms is an optional package, we will need to add guards to each file that imports fms similar to the other aiu_addon files.

[ani300]

@BrandonGroth done