Improve JAX build tool

[phu0ngng]

Description

• Enabling parallel build with cmake via -j.
• The current configs create two build directories, one is TE_PATH/build_tools/build/cmake, the other is TE_PATH/build. So I introduced a change in which cmake directory is created under TE_PATH/build, thus no build directory under TE_PATH/build_tools is created.
• Adding an option to select particular files with the same file extensions (for example *.cpp) in all_files_in_dir.

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Infra/Build change
• [ ] Code refractor

Checklist:

• [x] I have read and followed the contributing guidelines
• [x] The functionality is complete
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[ksivaman]

/te-ci pytorch

[timmoon10]

I've cherry-picked this into release_v1.8 because putting the CMake build directory was causing our CI scripts to leak the build directory into our nightly containers. Putting the build directory back in the root directory fixes this problem.