Added jit log stream changing function and some refactor

[narang99]

Description:

• Have only added stdout and stderr as possible options from python
  API for now. We can do file path passing later maybe.
• Put the class JitLoggingConfig in the cpp file as none of its methods were being used outside of this file.

Python API:
torch._C._jit_set_logging_stream('stdout|stderr')
C++ API:
::torch::jit::set_jit_logging_output_stream(ostream);

Testing:

• Tested python API locally.
• Unit test for the C++ API is written

Fixes #54182

[facebook-github-bot]

🔗 Helpful links

• 🧪  See artifacts and rendered test results at hud.pytorch.org/pr/65768
• 📄  Preview docs built from this PR
• 📄  Preview C++ docs built from this PR
• 🔧  Opt-in to CIFlow to control what jobs run on your PRs

💊 CI failures summary and remediations

As of commit ed78826 (more details on the Dr. CI page):

---

✅ None of the CI failures appear to be your fault 💚

---

• 1/1 broken upstream at merge base d4d3bb9 on Sep 30 from 11:34am to 3:29pm

---

🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is older than viable/strict, run these commands:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

• linux-xenial-py3.6-gcc5.4 / test (backwards_compat, 1, 1, linux.2xlarge) on Sep 30 from 11:34am to 3:29pm (9ae63bd - 24f59fa)
  • 🔁 rerun

---

This comment was automatically generated by Dr. CI (expand for details).

Follow this link to opt-out of these comments for your Pull Requests.

Please report bugs/suggestions to the (internal) Dr. CI Users group.

Click here to manually regenerate this comment.

[narang99]

I checked the occurrences of TORCH_API and its being used before the return type for function signatures in other files. So I modified the signatures in this one too to follow the convention

[ZolotukhinM]

LGTM!

[facebook-github-bot]

@ZolotukhinM has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[ZolotukhinM]

I got some internal testing failures, and I think it's because we're missing "::torch::jit" namespace before "get_jit_logging_output_stream". Do you mind adding it?

[facebook-github-bot]

@ZolotukhinM has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.