Added ability to skip platforms when ejecting

[EvanBacon]

• support managed projects in eas build by disabling certain platforms when ejecting
  • skips the bundle id or package name prompt
• added --platform to expo eject to choose platforms (ios, android, all (like eas)).
  • tested that a project without a corresponding native folder can sync successfully
• added platforms to mod compiler, this is used for skipping any mod on a particular platform.
  • third-party plugins that use a particular mod will automatically be compliant
  • missing native files won't be written or read