[1/N][Chore] Add pre-commit hooks

[MortalHappiness]

Why are these changes needed?

Add pre-commit hooks supports so that developers can know format errors without running the CI.

Reference: https://github.com/nginxinc/nginx-gateway-fabric/blob/0b0f7111364cd6f06883e414f7ef118207ee7677/.pre-commit-config.yaml

Related issue number

N/A

Checks

• [x] I've made sure the tests are passing.
• Testing Strategy
  • [ ] Unit tests
  • [x] Manual tests
  • [ ] This PR is not tested :(

[kevin85421]

I tried it locally by adding trailing whitespaces in a YAML file. It works. Niceeeeee!