Prepare the project for archiviation

[cortinico]

I'm preparing to archive this repo as we moved the compiler plugin to https://github.com/detekt/detekt/tree/main/detekt-compiler-plugin

Sadly we had so much code in main which was unreleased (last release was in 2020). So I believe we should release 0.4.0 from the current main and then archive this repo as it can create unnecessary confusion. The publishing of the compiler plugin artifact was not set up after @3flex refactored it out from the corresponding Gradle plugin, so I'm doing it here.

Once this PR gets merged, I'll release 0.4.0 and archive the repo afterwards 👍

I've also released 0.3.3 which was available in Gradle Portal but not on Github:
https://github.com/detekt/detekt-compiler-plugin/releases/tag/0.3.3

[3flex]

Completely agree on archiving. I don't think there's much value in publishing the new from this repo though, if anyone really wanted to use it they would have requested a new release before now, but there's no harm if you feel like it!

I'm assuming we can migrate issues after the repo's archived? The four that are open are still valid. We should migrate them to the main detekt issue tracker.

[cortinico]

it they would have requested a new release before now, but there's no harm if you feel like it!

@ZacSweers asked one on #detekt Slack here https://kotlinlang.slack.com/archives/C88E12QH4/p1674255378777759?thread_ts=1669929967.434529&cid=C88E12QH4