Add code quality workflows: format and tidy

[carlopi]

No description provided.

[carlopi]

While this PR is ready, it's probably worth waiting a bit longer to first absorb the rest of the work.

[Mytherin]

Maybe we can just move the extension code to src like other extensions?

[carlopi]

Yes, moving to src is right, I will do so post 1.3.2 given there are a bunch of in-flight PRs.

Also format code might need to take the paths from a Makefile variable instead of hardcoding, but that's minor.

[Tmonster]

I think this happens via the extension-ci-tools repo by default right? So this can also be closed?

[carlopi]

No, this needs to be added on a repo-by-repo basis, at the very least adding something like:

  code-quality:
    name: Code Quality
    uses: duckdb/extension-ci-tools/.github/workflows/_extension_code_quality.yml@main
    with:
      extension_name: httpfs
      duckdb_version: v1.3-ossivalis
      ci_tools_version: main
      extra_toolchains: 'python3'
      format_checks: 'format;tidy'

or equivalent (maybe changing branch names)