Add cuda amp scaler for eager

[BBuf]

eager amp 支持 scaler ，eager 可以做完整的 amp 训练。

https://github.com/Oneflow-Inc/OneTeam/issues/1754

export ONEFLOW_VM_COMPUTE_ON_WORKER_THREAD=0之后 eager amp测试结果：

无论是训练速度还是显存占用相比于fp32模式都有较大的提升。

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[hjchen2]

后续可以顺便支持一下cache功能

[marigoold]

后续可以顺便支持一下cache功能

cache 有 PR 了，amp 合并就继续推进

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CI failed when running job: Build cpu. PR label automerge has been removed

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Static analysis with clang failed. PR label automerge has been removed

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CI failed when running job: cuda-speed-test. PR label automerge has been removed