Add support for running tests and main

[Detrous]

• Add runnables.scm with queries to detect test methods, test classes, nested test classes and main functions
• Add tasks.json with commands to run tests/main via Gradle/Maven

Nuances

• Handles Kotlin backtick-escaped method names (e.g. should return true) by stripping backticks for the test filter
• Detects Gradle multi-module subprojects via cut on the relative file path, running :module:test instead of test to avoid "No tests found" failures when --tests filter applies to all subprojects

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @Detrous on file. You can sign our CLA at https://zed.dev/cla. Once you've signed, post a comment here that says '@cla-bot check'.

[Detrous]

@cla-bot check

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @Detrous on file. You can sign our CLA at https://zed.dev/cla. Once you've signed, post a comment here that says '@cla-bot check'.

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[Detrous]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[MrSubidubi]

Thanks for this! Could you look into the CI failure, please?

[Detrous]

runnables.scm formatted, could you please run CI again ?

[Detrous]

@MrSubidubi do you want me to adjust anything else or it can be merged ?