Add ios support

[eygraber]

Now that there's Android and JVM KMP support (thank you!), it would be excellent if we could have ios support as well. When I try to use DAGP in my KMP projects that have ios targets, I get too many issues related to ios (I'll try and collect them here).

Actual support would be best, but if there was a way to easily ignore issues related to ios until then that would also be great.

[eygraber]

One issue I run into is that if I have a KMP project with an Android and ios target, and I use Compose Multiplatform, the Android variant uses android.compose while the ios one uses org.jetbrains.compose. In commonMain I depend on org.jetbrains.compose.

DAGP reports a missing transitive dependency on androidMain for androidx.compose, and an unused dependency on commonMain for org.jetbrains.compose.