feat: expo config plugin

[artus9033]

Summary

Our brownfield plugin has previously worked with Expo, but required manual setup. This PR provides an Expo config plugin to automate that, and a demo Expo application for testing. The plugin applies all the setup steps we described in brownfield's docs, automatically, during expo prebuild. Additionally:

• it scans Expo & friends for transitive dependencies -> filters out ones that are already bundled with our AAR -> leaves only necessary ones -> injects them to both Gradle metadata & Maven POM files for publication
  • • this process is a bit more complicated: we mimic Gradle's dep resolution mechanics by storing only top versions in a set-like structure
• adds missing Coil dependencies that are not detected but needed for Expo < 55

Demo apps & CI have been adjusted:

• AndroidApp now
• CI has 2 jobs running in parallel: one packaging RNApp and the other ExpoApp, then each building the corresponding flavor of AndroidApp

CLI has been adjusted to run the Expo prebuild if expo is both: detected installed & explicitly listed in the package.json so as not to produce false positives in monorepo setups.

Finally, the CLI is updated to work seamlessly with Expo projects.

Screenshots

Android CLI screenshots

iOS CLI screenshots

Android app: Expo variant

Android app: vanilla variant

Test plan

CI green.