Added Move Kotlin Directory refactoring

[oleg68]

Summary

• add folder-context Move Kotlin Directory with recursive Kotlin-only source selection
• preserve selected directory hierarchy, update matching packages and direct Kotlin imports, and support atomic rollback/undo
• place the directory action in the folder Refactoring submenu

Verification

• python3 build-scripts/update-copyright.py --all && python3 build-scripts/update-copyright.py --check
• focused Move File/Directory tests
• mvn clean test (812 tests)
• mvn clean package -DskipTests
• manually verified directory move, package/import update, undo, and Refactoring submenu placement

🤖 Generated with Claude Code