feat: elide intellij plugin

[darvld]

Summary

This PR introduces an Intellij IDEA plugin providing support for Elide as an External Build System, which allows users to edit Elide projects in the IDE, build, run, and sync them.

Roadmap (initial plugin release)

The first release will have a basic but complete set of features to enable the use of Elide in simple projects. This includes most of the capabilities expected of an external build tool in Intellij IDEA (project sync, dependency management, building, and running).

This release will be focused on Kotlin and Java, support for other languages (and polyglot features) will be added later.

• Project auto-import and sync button.
• Read project structure (modules and content roots) from elide.pkl.
• Inform Intellij IDEA about dependencies on disk using the lockfile.
• Run elide install on project sync if the lockfile is not up to date or dependencies are not found on disk.
• Allow building project with elide build using the "build" icon in the IDE.
• Allow running the main entry point with elide run using the "run" icon in the IDE.
• Register tasks in the IDE for scripts and entry points found in the manifest.
• Add "run with Elide" action to the IDE, similar to the "run Gradle task" action.
• Add IDE actions for all relevant Elide commands (install, build, run, project info)
• Add the ability to run entry points with Elide when clicked from the "run" gutter icon.
• Allow forcing a specific Elide distribution to be used given its path in the settings.
• Add notification to install Elide if it is not found on PATH and no custom distribution is selected.

Additional features (future releases)

In the future, the plugin will be enhanced with quality-of-life features and a better integration with the rest of the languages supported by Elide.

• Add the ability to run JVM tests with Elide.
• Add debug capabilities for JVM languages.
• New project wizard templates for Elide projects (using elide init or otherwise).
• Improved integration with Pkl plugin for manifest editing.
  • Injection of fully qualified class names and file paths for entry points.
  • Injection of artifact names already declared in the manifest.
  • Gutter icon for running entry points and scripts.
  • Gutter icon for installing dependencies of all or specific ecosystems.
  • Gutter icon for performing individual artifact builds.
• Research adding support for non-JVM languages in the IDE (parity with JVM features).
• Research adding support for polyglot projects in the IDE (cross-language features).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.50%. Comparing base (4e26cf3) to head (acf37b4).
Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1505      +/-   ##
==========================================
- Coverage   41.99%   40.50%   -1.50%     
==========================================
  Files         680      698      +18     
  Lines       31366    32420    +1054     
  Branches     4386     4481      +95     
==========================================
- Hits        13172    13131      -41     
- Misses      16627    17761    +1134     
+ Partials     1567     1528      -39     

Flag	Coverage Δ
jvm	40.50% <ø> (-1.50%)	⬇️
lib	40.50% <ø> (-1.50%)	⬇️

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see 178 files with indirect coverage changes

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