Add ruby support via solargraph

[sbrudz]

This PR adds support for the ruby language by adding the solargraph LSP server.

We're also interested in adding ruby-lsp as an alternative server in a future PR. Not sure of the preferred way to support multiple LSP servers for the same language, though. If you have any recommendations, please let me know.

[sbrudz]

@microsoft-github-policy-service agree company="Def Method"

[LakshyAAAgrawal]

Dear @sbrudz

Thanks for the amazing PR! Could you please have a look at the following error being thrown in the automated ruby tests (https://github.com/microsoft/multilspy/actions/runs/12918692497/job/36099508872?pr=46#step:5:205)? Can we try to make it so that it works gracefully across versions?

Please let me know your bandwidth and availability, and thanks a lot for your contribution!

Once this issue is addressed, I will be able to merge the PR.

[sbrudz]

Thanks for reviewing!

I've removed the part of the code that checked the .ruby-version file, so it should now work more gracefully across ruby versions.

I tested this on another repo locally and solargraph was able to handle indexing older ruby code while running via a newer ruby version without any issues.

[sbrudz]

I'll take a look at the test failure in commit 1b934d3.

[LakshyAAAgrawal]

We're also interested in adding ruby-lsp as an alternative server in a future PR. Not sure of the preferred way to support multiple LSP servers for the same language, though. If you have any recommendations, please let me know.

This is excellent. Please have a look at #39 , and let's discuss there the appropriate way to support multiple programming language <> multiple LSPs.

[sbrudz]

The tests should all be passing now. Let me know if you'd like me to squash some of the commits to clean things up.

I'll take a look at #39 tomorrow.