feat: yarn 3 support

[yungblud]

Summary

• bumped up root package manager (yarn version) to 3.6.4 which is suggested version from react-native.

Motivation

• Wanted to bump up yarn version with same version as react-native is suggesting.
• From react native upgrade helper web site, you can find out packageManager
  • https://react-native-community.github.io/upgrade-helper/?from=0.73.6&to=0.76.0-rc.4
  • https://react-native-community.github.io/upgrade-helper/?from=0.73.6&to=0.76.0-rc.4#RnDiffApp-package.json

Changes

• added .yarnrc.yml
• modified .gitignore for yarn files

Test plan

[yungblud]

Having an issue with "yarn install" and "yarn.lock" in examples project such as "examples/bare"
Have a look this issue. #4250

[freeboub]

I confirm that my project also uses yarn 3 without any issue (but not yet react native 0.76)

[KrzysztofMoch]

@yungblud I have made PR that change packageManager to bun and change our repo structure to monorepo #4255

[yungblud]

@yungblud I have made PR that change packageManager to bun and change our repo structure to monorepo #4255

@KrzysztofMoch Cool! It seems pretty nice!
I will close this PR as your PR #4255 does similar stuffs alternatively.