Publish gradle plugin properly

[NikkyAI]

following the guide at https://docs.gradle.org/current/userguide/publishing_gradle_plugins.html
this should make publishing to the gradle plugin repo easier

integrate this step into your publishing workflow or CI

$ ./gradlew publishPlugins -Pgradle.publish.key=<key> -Pgradle.publish.secret=<secret>

tested with publishToMavenLocal

allows to use atomicfu plugin with the following syntax:

plugins {
    id("kotlinx-atomicfu") version "0.16.3"
}

fixes #56

[ArcticLampyrid]

Wonder what got this stuck

[Nek-12]

Why don't we merge this?

[mvicsokolova]

Hi! Thank you and sorry for the delay 🙏🏻 I tested publishing the plugin to the local Space repo and got some problems. I'm working on updating the script.

[hfhbd]

Could we change the id to org.jetbrains.kotlin.plugin.atomicfu as requested in #74?

[willflier]

It's been 5 months, any updates？

[Nek-12]

It's been a year, any updates?

[mvicsokolova]

Hi there! I apologize for such the delay in publishing the plugin. It wasn't an immediate priority before. Now, I'm focusing on stabilizing the library, and simplifying the plugin application is currently in progress. The plugin will be published to GPP, and no buildscript configurations will ne necessary in the next few releases.
Thank you!