[CI] clang-format C++ code and add to linting

[icfaust]

Description

the _clang_format file is used by generator/gen_daal4py.py though it is not stated anywhere. However, this is not used to format the codebase. Therefore file is moved with the daal4py code and now also formats it. A general .clang-format is added so that clang-formatting can be applied to specific folders without applying everywhere. The onedal/ folder contains its own .clang-format and is now applied to the C++ code there. It is used, applied, and is now included in the .pre-commit-config.yaml. It will be tested going forward like black and isort.

Majority of the changes are due to applying clang-format.

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• I have measured performance for affected algorithms using scikit-learn_bench and provided at least summary table with measured data, if performance change is expected.
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• I have extended benchmarking suite and provided corresponding scikit-learn_bench PR if new measurable functionality was introduced in this PR.

[icfaust]

/intelci: run

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[icfaust]

/intelci: run