Proposal: Add a pre-commit hook configuration

Nobody has claimed this yet.

Hi everyone,

I’ve noticed that some of the .td (TableGen) files in the repository contain trailing whitespace and minor formatting inconsistencies. To help avoid these and others in the future, and to make contributor workflows a bit smoother, I’d like to propose adding a [pre-commit](https://pre-commit.com/) configuration to the repo.

A pre-commit setup would:
* Automatically strip trailing whitespace and fix end-of-file newlines
* Enforce consistent formatting by using the same fixed clang-format version used in CI
* Make it easier for contributors to catch common issues locally before committing

This would not affect build behavior and can be gradually adopted.
If people are open to the idea, I can open a PR with a minimal `.pre-commit-config.yaml` and documentation on how to enable it.

WDYT?

Start by reviewing the repository's existing CI clang-format version and the formatting issues in the .td (TableGen) files. Define a minimal .pre-commit-config.yaml that uses that fixed version, strips trailing whitespace, and enforces end-of-file newlines; document how contributors enable it. Done means the hooks reproduce the relevant CI formatting checks without changing build behavior.

Written by the indexing model from the issue text.