[commands] command typehint updates

[IAmTomahawkx]

Pull request summary

This PR updates the ext.commands argument parser to add support for the following:

• typing.Optional[T] / T | None
• typing.Union[T, TT] / T | TT
• typing.Annotated[T, func]

Checklist

• [x] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
  • [x] I have updated the changelog with a quick recap of my changes.
• [ ] This PR fixes an issue.
• [x] This PR adds something new (e.g. new method or parameters).
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)

[chillymosh]

LGTM