Refactor DropdownMenu to typescript

[rajnish93]

Description

Refactor DropdownMenu to TypeScript #35744

Testing Instructions

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
• I've updated related schemas if appropriate.

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @rajnish93! In case you missed it, we'd love to have you join us in our Slack community, where we hold regularly weekly meetings open to anyone to coordinate with each other.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[ciampo]

Hey @rajnish93 , thank you for your effort.

As explained in #35744 (comment), it may still be a little bit early to work on this task — it's probably better if we champion a few refactors first to understand any caveats along the way!

I would also ask you to mark this PR as a draft while work is in progress — thank you!

[t-hamano]

It seems that the refactoring of the Dropdownmenu component has been completed in #50187, so I would like to close this PR. If there's anything I've missed, please comment.