[Feature]: support FP8 communication in DDP, FSDP, Gemini (#5928)

* support fp8_communication in the Torch DDP grad comm, FSDP grad comm, and FSDP params comm

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* implement communication hook for FSDP params all-gather

* added unit test for fp8 operators

* support fp8 communication in GeminiPlugin

* update training scripts to support fsdp and fp8 communication

* fixed some minor bugs observed in unit test

* add all_gather_into_tensor_flat_fp8

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* add skip the test if torch < 2.2.0

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* add skip the test if torch < 2.2.0

* add skip the test if torch < 2.2.0

* add fp8_comm flag

* rebase latest fp8 operators

* rebase latest fp8 operators

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