chore(MeshAccessLog): improve policy's openapi schema

[bartsmykla]

Added kubebuilder annotations with defaults and examples to generate better openapi schema.

Checklist prior to review

• Link to relevant issue as well as docs and UI issues
  • Closes Simplify and make MeshAccessLog API consistent before GA #8223
  • Improve OTEL docs on body format kuma-website#1538
  • MeshAccessLog - add support for timeout and retry for TCP backend #8348 (comment)
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS
  • It won't
• Tests (Unit test, E2E tests, manual test on universal and k8s)
  • No changes which would require new tests
  • Don't forget ci/ labels to run additional/fewer tests
• Do you need to update UPGRADE.md?
  • There is no need
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label)
  • It doesn't

Changelog: skip

[bartsmykla]

/format