[WIP] Migrate anvil contribution merging to KSP

[IlyaGulya]

Background

This PR migrates current kapt-based Anvil contribution merging to KSP one. Works with K2 🙂

Changes

• Replaced flipper.anvil.kapt plugin with flipper.anvil.entrypoint
• Upgraded Anvil to 2.5.0-beta10-SNAPSHOT (requires publication of https://github.com/ZacSweers/anvil to mavenLocal()`
• Introduced new commonKsp configuration to remove warnings about usage of ksp configuration in KMP projects
• Use default kotlin hierarchy instead of specifying dependsOn manually.

Test plan

If it builds, it works