Create Color<->rgba utils on all platforms

[zeyap]

Summary:

Changelog

As a followup to https://github.com/facebook/react-native/pull/45139

There I only implemented hostPlatformColorFromRGBA and alpha/red/green/blueFromHostPlatformColor on cxx platform, then used cxx platform specific method at some places. but really I should implement and use methods in Color.h that are platform agnostic

• cxx/android: platform color format is int32_t, RGBA are 8bit unsigned int ([0,255])
• windows: platform color format is winrt::Windows::UI::Color where RGBA props are 8bit unsigned ints ([0,255])
• apple: platform color format is UIColor where RGBA props are floats in [0,1]

[Internal]

Differential Revision: D59593659

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D59593659

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	21,234,713	-15
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	24,431,907	-15
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 0fd4a9447e432b8c537825f571409f56ae63dc90 Branch: main

[facebook-github-bot]

This pull request has been merged in facebook/react-native@97882a16b8232231425b7122abf92483cdb9f27b.

[github-actions[bot]]

This pull request was successfully merged by @zeyap in 97882a16b8232231425b7122abf92483cdb9f27b

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