fix: android plugins now built using same “gradle” as apps

[farfromrefug]

• copy paste for now. I think most could be refactored in the runtime and cli should include from there
• not kotlin, buildtools, … versions are define like in apps and use same defaults
• we dont modify the build.gradle for tempPlugin anymore. Instead we add the plugin as a native dep (to itself..) and just ignore the aar that we would build (which can already be there).
• now users can do almost anything they want in their plugin include.gradle and it will work (for example comments on the first line would break the build)
• now while building a tempPlugin we pickup any external aar we find the plugin platforms folder (main reason for this change)