CI: Implement automatic pre-commit checks with a GHA workflow

[leo-amd]

hooks:
-   id: trailing-whitespace
-   id: check-ast
-   id: check-json
-   id: check-merge-conflict
-   id: check-toml
-   id: check-yaml

[jithunnair-amd]

Thanks @leo-amd for the PR. Let's merge this PR only after all the pre-commit checks are clean.

@amd-sriram It seems the extra spaces check caught some legit instances: https://github.com/ROCm/apex/actions/runs/23252552729/job/67598289100?pr=320
Can you please fix them in a different PR, so we can rebase this PR and rerun the checks to go to the next set of errors? If you run these pre-commit checks locally, that'd be best.