use shaded libs to improve detekt stability

[litols]

Motivation:

• detekt relies on kotlin-compiler as a dependency, requiring strict adherence to Kotlin's version.
• The detekt plugin leverages the Kotlin compiler included in IntelliJ IDEA's Kotlin plugin, making it challenging to specify the Kotlin plugin's version precisely on the plugin side.
• Consequently, version mismatches are prone to occur, leading to the instability of the detekt-intellij-plugin.

Modification:

• To address this issue and ensure the stability of detekt, we propose creating a shaded JAR with relocated kotlin compiler PSI dependencies.
• This allows us to fix the Kotlin PSI version used by detekt, minimizing potential issues stemming from Kotlin version discrepancies in the detekt-intellij-plugin.

[litols]

https://github.com/JetBrains/gradle-intellij-plugin/blob/a10fd139467dd34c8e292296b563edfed14fea9d/src/main/kotlin/org/jetbrains/intellij/IntelliJPlugin.kt#L611
runtimeClasspathFiles uses to include depended libraries and plugins.
From this changes applied, we use shadow jar, which included libraries, so we can replace runtimeClasspathFiles empty.

[arturbosch]

Hi,
which problems did you had with mixing the detekt and kotlin plugins?
Detekt uses the embeddable compiler and Intellij the unshaded compiler, which conflicts occur?
For example gradle runIde runs the detekt plugin besides the Kotlin 1.6 plugin and it works fine on my side.

You think this change also fix showing Kotlin compiler errors as detekt plugin errors #271 ?

Unfortunately shading the compiler lib does not help with using the normal compiler classes: #271
2023-11-05 16:45:29,195 [ 25461] SEVERE - #c.i.o.u.ObjectTree - class org.jetbrains.kotlin.psi.KtNamedFunction cannot be cast to class detekt.shadow.org.jetbrains.kotlin.psi.KtModifierListOwner

[arturbosch]

I think this line triggers the shadowJar task eagerly.

tasks.withType<PrepareSandboxTask>.configure {

[arturbosch]

Suggested change

	withType<ShadowJar> {
	tasks.withType<ShadowJar>.configure {

[litols]

sorry for too late response.

which problems did you had with mixing the detekt and kotlin plugins?

#271. (but after upgrade the plugin to 2.2.0, running in IntelliJ IDEA 2023.2.4 + Kotlin plugin 232-1.9.20-release-507-IJ10072.2, these error is not occurring...)

Detekt uses the embeddable compiler and Intellij the unshaded compiler, which conflicts occur?
You think this change also fix showing Kotlin compiler errors as detekt plugin errors #271 ?

I think kotlin plugin picking up the kotlin compiler from detekt plugin wrongly.
Reasons:

• many issues reports detekt plugin related, however it is not have a detekt related classes in stacktrace.
• newly kotlin plugin + latest detekt plugin is works fine

Thus,I think we can mitigate #271 with relocating the classes which uses in kotlin plugin.

JFYI, kotlin-intellij-plugin is relocating kotlin PSI files,
https://github.com/nbadal/ktlint-intellij-plugin/tree/main/lib
but the relocating is applied partially, it seems we need picking up correct classes.
maybe KtNamedFunction need to excluding from relocating in detekt-intellij-plugin.

Anyway, I've applied your review comments to this pull request. thank you for your review!