Revert "Revert "[Reland][CPU] Add ops for float8 linear" (#3179)"

[Xia-Weiwen]

This reverts commit 30082cb.

The commit was reverted because of #3175. However, the issue was not caused by this commit but a bug in setup.py. And the issue will be fixed via #3187.

So, this PR re-apply the commit that was reverted.

Original PR: #3100 and #3052

Test plan

pytest -sv test/test_ops.py -k test_float8_linear_cpu

[pytorch-bot]

🔗 Helpful Links

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[Xia-Weiwen]

CC @mingfeima for review. Thanks.

[Xia-Weiwen]

Hi @vkuzo Would you mind if we add this back? Removing this does not resolve #3175 after all. Thanks.

[Xia-Weiwen]

Hi @vkuzo @jerryzh168 Do you think we can land this now? Thanks.

[Xia-Weiwen]

Hi @vkuzo @jerryzh168 Would you mind if we land this now? It's not the cause of building errors on Windows. Thanks.

[jerryzh168]

sorry for the delay

[Xia-Weiwen]

Thanks.