Create script to automatically set CLANG_CXX_LANGUAGE_STANDARD on the client project

[f-meloni]

Summary

Currently this section of the Playbook tells us to set CLANG_CXX_LANGUAGE_STANDARD = "c++17" in the main app target for the new architecture to work.
Would be nice to be able to automate that instead

Changelog

[iOS] [Added] - Cocoapods function to add the CLANG_CXX_LANGUAGE_STANDARD to all the targets if needed

Test Plan

I've created some unit tests for the newly added function.
I've executed pod install and the ruby tests locally.

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[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 05aaba9
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,782,987	+0
android	hermes	armeabi-v7a	7,186,490	+0
android	hermes	x86	8,094,636	+0
android	hermes	x86_64	8,072,077	+0
android	jsc	arm64-v8a	9,655,567	+0
android	jsc	armeabi-v7a	8,427,832	+0
android	jsc	x86	9,607,819	+0
android	jsc	x86_64	10,202,447	+0

Base commit: 05aaba9
Branch: main

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

[facebook-github-bot]

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

[facebook-github-bot]

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

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

[react-native-bot]

This pull request was successfully merged by @f-meloni in ca8174e.

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