Warn about link-linked packages when using autolinking #445
Description
Describe the Feature
In order for autolink to work properly, the libraries linked with link need to be unlinked, otherwise the build will likely fail because of duplicate headers declaration or similar.
Possible Implementations
We could dry-run link before run-ios and run-android commands, collect the information about already linked modules and output a descriptive warning. Some packages are still not compatible with autolinking, so we can't really make it a hard error. Unless we can somehow tell the users to unlink every package and link the unsupported ones again (so it uses Podfile), but that will be tricky.