Add support for debugging

[ayoub-benali]

Requires:

• Installing https://github.com/daveleroy/sublime_debugger
• Linking with Metals https://scalameta.org/metals/docs/integrations/debug-adapter-protocol
• Implementing debug-adapter-start command
• Might also require Align the documentation of how to do debugging with official docs, help beginners to get started with debugging metals#3272
  Java reference: https://github.com/sublimelsp/LSP-jdtls and Java adapter daveleroy/SublimeDebugger#106

It would nice to get this working as well https://scalameta.org/metals/blog/2020/11/20/lithium/#navigating-stacktrace

[jvican]

@ayoub-benali Have you started any work on this at all? It'd be very nice to be able to use this with Sublime Debugger, in the same way that you can with other languages (Rust, C++, etc). It might also be potentially nice to be able to run all tests with Terminus like in the Rust extension.

[ayoub-benali]

Hi @jvican, I started some time ago but I didn't go far (see issue) and for the moment I can't allocate much time for it :/