feat: add conditionals for iOS only code in RCTDeviceInfo.mm

[okwasniewski]

Summary:

Having React Native support every Apple platform is tough to achieve as it introduces many platform-specific ifdefs.

On the other side, maintaining an OOT platform fork is already a demanding job, so to make it easier I propose adding ifdefs for iOS-specific code. Thanks to this change, OOT platforms can focus on their OS-specific features while the core is also adding iOS-specific features behind ifdefs. Fortunately, most of the code on Apple platforms can be shared and this PR aims to introduce better support for this and to minimize OOT fork's surface.

In this example RCTDeviceInfo.mm has support for handling orientation changes and the availability of this feature across Apple OS looks as follows:

Platform	Support
macOS	❌
tvOS	❌
visionOS	❌
iOS/iPadOS	✅

Here is a table from TargetConditionals.h header file which shows the coverage of TARGET_OS_IOS macro. (It supports both iOS and iPadOS)

Changelog:

[INTERNAL] [ADDED] - Conditionals for iOS only code in RCTDeviceInfo.mm

Test Plan:

CI Green

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	20,299,696	-14
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	23,496,902	-5
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: d3e0430
Branch: 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 c5653a0.

[github-actions]

This pull request was successfully merged by @okwasniewski in c5653a0.

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