Merge and modernize multi-language eggs (CMake, Kotlin, Python uv support, Java updates)

[itzzjustmateo]

⚠️ This PR is UNTESTED and should be reviewed carefully before merging.

This PR consolidates and modernizes several language eggs to improve consistency, maintainability, and support for newer tooling across the repository.

Summary of changes

CMake egg (replaces C# egg)

• Replaced previous C# (.NET) egg with a new CMake-based build system egg
• Now supports C, C++, and C# projects in a unified build environment
• Added optional Ninja build system support for faster builds

Kotlin egg (new)

• Introduced a new Kotlin runtime egg from scratch

• Supports:

  • Kotlin scripts (.kt)
  • Gradle projects
  • Maven projects

• Designed for JVM-based Kotlin workloads with proper toolchain handling

Python egg update

• Added optional support for uv package manager
• Keeps pip as the default package manager for compatibility
• Allows uv as an optional modern alternative

Java ecosystem notes

• Improved clarity and consistency across JVM-based language support (Java + Kotlin)

Notes

• No production testing has been performed yet
• Review and validation in a test environment is strongly recommended before merge
• Changes focus on modernization and consistency across eggs

Resolves

This PR resolves #10
This PR also resolves #7