refactor: extract cli-config-apple for linking

[thymikee]

Summary:

Extract a new cli-config-apple package for linking purposes, so that we can import dependencyConfig and projectConfig without all the command code.

Test Plan:

Existing tests, no public API should be affected

Checklist

• Documentation is up to date to reflect these changes.
• Follows commit message convention described in CONTRIBUTING.md

[szymonrybczak]

Left small nit comment. I see that config.test.ts is failing but that's because we didn't update our snapshots after new major release of React Native, rest looks good! 🙌