Monorepo [0/?] - move move github actions to root

[tjzel]

About

This pull request is a part of the effort of migrating to monorepo structure:

• Monorepo  #5992

Summary

Moving .github directory to the root of the project, alongside with fixes that regard new repository structures.

This pull request won't fix CIs which are being tackled in

• Fix CI issues with yarn #5996

Test plan

No CI should fail on a step related to the change of the monorepo structure.

Steps achieved towards monorepo

• All CI pass
• Precommit scripts work properly
• react-native-reanimated is a separate workspace which uses hoisted node_modules
• app is a separate workspace which uses hoisted node_modules
• paper example is a separate workspace which uses hoisted node_modules
• fabric example is a separate workspace which uses hoisted node_modules
• web example is a separate workspace which uses hoisted node_modules
• macos example is a separate workspace which uses hoisted node_modules
• example is a separate workspace which uses hoisted node_modules
• reanimated eslint plugin is a separate workspace which uses hoisted node_modules
• the npm package builds and works as expected
• reanimated2 directory is removed
• TypeScript, ESLint and Prettier configs are unified and only extended when necessary in workspaces

[tjzel]

cc @tomekzaw

If you could explain to me (preferably offline) how does the memoization work here.

[piaskowyk]

⚠️ After merging all monorepo PRs, this PR will break all CI processes due to path changes. However, let's merge it to avoid complicating the merging process, and we can address the necessary fixes immediately afterward.