Add support for sessions to share a global threadpool.

[pranavsharma]

Description: Add support for sessions to share a global threadpool.

Motivation and Context
The OCR team has a requirement to run multiple sessions (models) in a process. ORT creates an intra and inter thread pool for every session. This is clearly not efficient in this scenario. Hence, we need to design a way to have these 2 thread pools be shared between multiple sessions.

After discussion with the OCR team, option #3 in this design doc seems to be the simplest. They don't have any requirement for this feature to be available in language bindings other than C/C++.

Usage will be as follows. Also see documentation under docs/C_API.md.

1. Call CreateEnvWithGlobalThreadPools()
2. Call DisablePerSessionThreads()
3. Call Run()

Also moved the logger to the Environment class as part of this change to facilitate easier passing of global threadpools to session. We wanted to do this any way.

[yuslepukhin]

#include "pch.h"

Does not seem to have changed

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Refers to: winml/adapter/winml_adapter_environment.cpp:5 in a4405e8. [](commit_id = a4405e8, deletion_comment = False)

[pranavsharma]

This is ready for review. Debugging the Android CI failure meanwhile....

[skottmckay]

&OrtApis::GetDenotationFromTypeInfo,

Move the 'feel free to add/remove/rearrange' down to V3, and update this to say DO NOT MODIFY as per the V1 comments #Closed

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Refers to: onnxruntime/core/session/onnxruntime_c_api.cc:1496 in c0e64c7. [](commit_id = c0e64c7, deletion_comment = False)

[pranavsharma]

Most of the test_inference/test_environment code is from before including the one that has the cryptic comment :-).

[pranavsharma]

Android

It looks like all tests exes are run inside the android emulator and hence even the global threadpools test exe shares the same env that was created before which explains the test failure. I don't know much about the emulator, so for now I'll disable these tests for android.

[skottmckay]