[CM/CMX] add pyproject.toml

[gfursin]

Since setup.py is being gradually deprecated, it will be useful to add pyproject.toml that will have equivalent behavior to current setup.py. It will require thorough checking across different OS...

[gfursin]

Hey @arjunsuresh and @anandhu-eng .

Just to let you know that I've added pyproject.toml to CM and deprecated setup.py.

It is now used in CM v3.4+.

It should be backwards compatible and all tests are passing but if you suddenly notice some issues in CM* automations or tests related to this change (maybe some tests are still using setup.py), please tell me.

However, I don't expect any issues since I tried to do an equivalent change.

Cheers!