benchmark

Add support for bzlmod (excluding Python bindings) (#1615)

* Migrate to bzlmod

* Update Python version to PY3, as indicated by the actual source file.

* Migrate more libraries & first draft of direct pywheel rule usage in Bazel

* Integrate with nanobind and libpfm

* Make Python toolchain a dev dependency

* Undo py_wheel usage until later

* Added support for bzlmod for C++ parts of google_benchmark.

* Make //tools:all buildable with --enable_bzlmod

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Co-authored-by: Andy Christiansen <achristiansen@google.com>