Summary:
Add support for `Platform.isMacCatalyst`
By default, Mac catalyst reports the idiom as an iPad, but you can check if it is Mac catalyst with a macro
There is technically the possibility to have the idiom return as a Mac, but that's not the default and almost definitely doesn't work in RN
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## Changelog:
[IOS] [ADDED] Add support for `Platform.isMacCatalyst`
Pull Request resolved: https://github.com/facebook/react-native/pull/38187
Test Plan: It compiles
Reviewed By: cortinico
Differential Revision: D47664425
Pulled By: cipolleschi
fbshipit-source-id: 09f43694aa9b5f980204474f0e07779acd5ed2c7
Jacob Parker
027d520d65