[dynamo][guards-c++-refactor] Introduce LeafGuard, GuardManager and GuardAccessor classes

[anijain2305]

Stack from ghstack (oldest at bottom):

• #120123
• #120119
• #120098
• #120096
• #120093
• #120091
• #120089
• #120068
• #120067
• #120065
• #120064
• #120062
• #120061
• #120060
• #119828
• #119833
• #119827
• -> #119822

The full blown implementation is in this stack - https://github.com/pytorch/pytorch/pull/110590 which is passing all the test cases on CI. That stack is hard to review. So, breaking apart.

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @chenyang78 @aakhundov @kadeng

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/119822

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:white_check_mark: You can merge normally! (1 Unrelated Failure)

As of commit b568644c1168fe0be1c1598676992aa1314685c8 with merge base 62e5840b36b6790a5008faa76a920c6d154897b9 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / linux-focal-cuda12.1-py3.10-gcc9-sm86 / test (default, 1, 5, linux.g5.4xlarge.nvidia.gpu) (gh) inductor/test_torchinductor_dynamic_shapes.py::TestInductorDynamicCUDA::test_full_cuda

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[anijain2305]

@jansel This is ready for another review.

[anijain2305]

@jansel Ready for re-review.

[anijain2305]

@pytorchbot label "topic: not user facing"