[chore] add changelog for 0.70

[Titozzz]

WIP

Summary

Adds changelog for new release.

Changelog

[Internal] [Changed] - add changelog entry for 0.70.0

Test Plan

N/A

[pull-bot]

	Fails
🚫	📋 Missing Changelog - Can you add a Changelog? To do so, add a "## Changelog" section to your PR description. A changelog entry has the following format: [CATEGORY] [TYPE] - Message. CATEGORY may be: General iOS Android JavaScript Internal (for changes that do not need to be called out in the release notes) TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.
🚫	❔ This pull request needs a description.

	Warnings
⚠️	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.

Generated by 🚫 dangerJS against 3058a54

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,636,640	-395
android	hermes	armeabi-v7a	7,048,633	-389
android	hermes	x86	7,938,607	-400
android	hermes	x86_64	7,910,640	-389
android	jsc	arm64-v8a	9,512,927	-291
android	jsc	armeabi-v7a	8,288,222	-282
android	jsc	x86	9,452,483	-295
android	jsc	x86_64	10,043,718	-289

Base commit: 5c109b3
Branch: main

[analysis-bot]

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

Base commit: 5c109b3
Branch: main

[kelset]

(remember that we need to add all the commits from the RC releases)

[facebook-github-bot]

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

[facebook-github-bot]

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

[facebook-github-bot]

@dmytrorykun 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 @Titozzz in 9c05f42.

^{When will my fix make it into a release? | Upcoming Releases}