Refactor :detekt-tooling

[BraisGabin]

Expected Behavior

:detekt-tooling is the public api for anyone that wants to implement a detekt client

Current Behavior

Right now we have a mixture between :detekt-tooling and :detekt-cli. And also :detekt-tooling has things that shouldn't be part of the API.

Context

I think that :detekt-gradle-plugin shouldn't use :detekt-cli. And it should depend on :detekt-core. But, because we don't want to make :detekt-core public, we can use :detekt-tooling as the public api containing only the interfaces, enums and similar classes.

[3flex]

Agree, tooling API should be the entry point for all clients - CLI, Gradle plugin and compiler plugin. And it should be used by the IDE plugin if it's not already (but I think it was originally introduced for that purpose?)