Add minimal pre-commit config

[olantwin]

Implement #390 .

For now, only local hooks (no CI config).

For now ruff, clang-format and some of the hooks included with pre-commit.

I'll add cmake-format and jsonnet-fmt next.

[olantwin]

@phlexbot yaml-fix

[knoepfel]

@phlexbot yaml-fix

[github-actions]

Automatic YAML formatter fixes pushed (commit 6ac2d04).
⚠️ Note: Some issues may require manual review and fixing.

[knoepfel]

@olantwin, apologies about the YAML format problems. The changes in .github/workflows are not formally related to this PR.

[greenc-FNAL]

Note: we use gersemi in place of cmake-format.

[olantwin]

Note: we use gersemi in place of cmake-format.

Thanks for the pointer! Added.