Fix callbacks not being fired on macOS ActionSheetIOS

[Saadnajmi]

Please select one of the following

• I am removing an existing difference between facebook/react-native and microsoft/react-native-macos 👍
• I am cherry-picking a change from Facebook's react-native into microsoft/react-native-macos 👍
• I am making a fix / change for the macOS implementation of react-native
• I am making a change required for Microsoft usage of react-native

Summary

Resolves #1680
On macOS, we implement ActionSheetIOS to be an NSMenu (not confusing at all). During the 0.71 merge, RCTActionSheetManager.mm was refactored a bit, and the macOS implementation wasn't properly updated. Thus, callbacks wouldn't get fired when you clicked on menu items.

While the fix is simple (initialize _callbacks on init), I decided to go ahead and refactor the diffs so that the iOS and macOS blocks are much closer to each other and share more code. I also added a few comments explaining some macOS differences we needed. This should help ensure that future merges are less likely to break this module.

Things to note:

• This PR also fixes the ability to disable menu items, which previously didn't work. Yay code sharing :D.
• NSMenu doesn't have a "cancel" menu item like iOS Action Sheet buttons do, you just click away to close the menu. So, we just don't add a menu item for any button marked as "cancel"
• NSMenuItems don't have a "destructive" style like iOS Action Sheet buttons do. So we don't do any special styling for them.
• I didn't refactor any of the Share dialog bit because there isn't a bug there, and I decided to leave as is.

Changeling

[MACOS] [FIXED] - Fix callbacks not being fired on macOS ActionSheetIOS

Test Plan

See video. Before, clicking any menu item would result in a warning that no callback is registered.

Screen.Recording.2023-05-25.at.12.34.53.PM.mov

[github-actions]

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