Add ApolloExtension.useGradleVariants

[martinbonnin]

This adds the apollo metadata as variants in the "java" software component instead of requiring a separate publication. This should fix publishing modules with apollo dependencies.

This is wildly experiment and only for JVM targets due to https://youtrack.jetbrains.com/issue/KT-58830/

If using this, you can remove the apollo publication:

apollo {
  // add this (experimental)
  useGradleVariants.set(true)
}

// remove this
publishing {
  publications {
    create<MavenPublication>("apollo") {
      from(components["apollo"])
      artifactId = "foo-apollo"
    }
  }
}

[svc-apollo-docs]

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[BoD]

👍