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.