Support Kotlin relocations

[Goooler]

Refs #1539.

[Copilot]

Pull Request Overview

This PR removes custom Kotlin metadata relocation support code and refactors the main Shadow plugin to handle Kotlin relocations directly. The changes integrate Kotlin class and module processing into the core ShadowCopyAction instead of maintaining separate plugin infrastructure.

• Removes dedicated KSR (Kotlin Shadow Relocator) plugin files and relocator classes
• Integrates Kotlin metadata processing directly into ShadowCopyAction
• Adds RelocationClassWriter to handle Kotlin-specific symbol table relocations

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
RelocatingClassWriter.kt	Removed - was handling Kotlin class symbol table relocations
MetadataAnnotationScanner.kt	Removed - was scanning and relocating Kotlin metadata annotations
KotlinShadowRelocatorPlugin.kt	Removed - was the main plugin entry point for Kotlin relocations
KotlinRelocation.kt	Removed - contained core relocation logic and extension functions
ShadowCopyAction.kt	Modified to include Kotlin module processing and use new RelocationClassWriter
RelocationClassWriter.kt	Added - new implementation for handling Kotlin class relocations

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[Copilot]

The isKotlinClass() method creates a ClassVisitor and processes the entire class file to check for a single annotation. This could be expensive for large classes. Consider using ClassReader.readUnsignedShort() and parsing annotations more efficiently, or caching this result to avoid repeated scanning.