Feature request: Logging APIs

[ZacSweers]

Similar to how annotation processing has Messager APIs, this would make communicating information to the user easy.

[ZacSweers]

Related - Messager allows accepting an element and reporting its source location, which is quite useful for debugging purposes when reporting warnings and errors

[neetopia]

First stage is done, needs more tweak to support multiple logging level and work properly with Gradle.

[neetopia]

removed from 1.0.0-beta as API itself is stable.

[ZacSweers]

Closing as this is implemented as KSPLogger!