feat: set Swift active compilation conditions build setting to DEBUG

[okwasniewski]

Summary:

This PR adds cocoapods utility to set SWIFT_ACTIVE_COMPILATION_CONDITIONS to DEBUG, which is set to this value by default (when generating a new native Xcode project).

This allows to use the #if DEBUG compilator directive in Swift to work out of the box, without any changes on user's side:

override func bundleURL() -> URL? {
#if DEBUG
    RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index")
#else
    Bundle.main.url(forResource: "main", withExtension: "jsbundle")
#endif
  }

Changelog:

[IOS] [ADDED] - Set SWIFT_ACTIVE_COMPILATION_CONDITIONS to DEBUG

Test Plan:

Run bundle exec pod install and check if the active compilation flags are populated:

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	16,803,066	-435,494
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	20,190,312	-410,683
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: b41a33ede99826aa6b100e5fb53b1a918a5b8bba Branch: main

[okwasniewski]

Hey @cipolleschi, anything I can do to help you get this one merged?

[okwasniewski]

@cipolleschi I've refactored the method to set_build_setting which accepts necessary arguments to set proper build settings. This method can remove set_use_hermes_build_setting and set_node_modules_user_settings methods (less code to maintain). I've also changed the tests to only test the utility

[cipolleschi]

/rebase - this command rebase the pr on top of main automatically

[okwasniewski]

Hey @cipolleschi, is there anything more we need to get done in order to merge this PR?

[cipolleschi]

/rebase - this comment automatically rebase on top of main

[facebook-github-bot]

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

[facebook-github-bot]

@cipolleschi merged this pull request in facebook/react-native@756f89aa59cba78cba39b22a338a3a48bcb38f1b.

[github-actions[bot]]

This pull request was successfully merged by @okwasniewski in 756f89aa59cba78cba39b22a338a3a48bcb38f1b.

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