[Pytorch Profiler] Introduce scopes to enableProfiler (#62417)

[Pytorch Profiler] Introduce scopes to enableProfiler (#62417)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62417

This diff adds an option to make enableProfiler enable callbacks only
for certain RecordScopes.
Why?
Profiling has some overhead when we repeatedly execute callbacks for
alls copes. On mobile side when we often have small quantized models
this overhead can be large. We observed that by only profiling top level
op and skipping profiling of other atend ops called within we can limit
this overhead. For example, instead of profling at::conv2d -> at::convolution ->
at::convolution_ and further more if ops like transpose etc. are called,
skipping profiling of those. Of course this limits the visibility, but
at the least this way we get a choice.

Test Plan: Imported from OSS

Reviewed By: ilia-cher

Differential Revision: D29993659

fbshipit-source-id: 852d3ae7822f0d94dc6e507bd4019b60d488ef69