Rework python build system to scikit-build-core

[dudoslav]

This PR introduces a new way of packaging Python library using scikit-build-core.

Main change had to be to move the pyproject.toml to the top-level folder.

For now we have to include .git in the sdist package, since the src/src/CMakeLists.txt uses git to query version.
In the future we would like to define these values during packaging process.

Also: I'll fix pipelines if this approach is acceptable
Also: This PR concerns tasks 38316 and 38319 as well

[shortcut-integration]

This pull request has been linked to Shortcut Story #38439: Try to rework the Python packaging for Vector Search to scikit-build-core in order to provide source distributions as well as binary distribution and simplify deployment..