Allow RCTAppDelegate pod to be imported as a module

[tsapeta]

Summary:

If another pod wants to depend on React-RCTAppDelegate and is written in Swift, the user needs to enable modular headers for this pod in the Podfile. This is not very convenient as this cannot be changed as part of the podspec, thus requires additional steps from the user. In Expo, our autolinking just fixes that automatically for all pods that require it (not only for RN's pods).

Changelog:

[IOS] [CHANGED] - Set DEFINES_MODULE xcconfig in React-RCTAppDelegate to generate a module map for this pod

Test Plan:

• rn-tester builds
• pod install with a dependency containing Swift code and depending on React-RCTAppDelegate no longer requires the user to use modular headers for this pod

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,890,106	+0
android	hermes	armeabi-v7a	7,938,112	-3
android	hermes	x86	9,287,765	+0
android	hermes	x86_64	9,189,420	+1
android	jsc	arm64-v8a	9,478,084	+2
android	jsc	armeabi-v7a	8,419,084	+2
android	jsc	x86	9,461,888	+2
android	jsc	x86_64	9,776,259	+2

Base commit: 5eaf28b
Branch: main

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[cipolleschi]

We need to check whether this works on Xcode 14.1 😔
For React Native 0.72.2 we had issues with a similar PRs and we had to revert it.

[github-actions]

This pull request was successfully merged by @tsapeta in 7c79e31.

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