feat: update code to work with ruby-lsp-0.17.1

[aaronlifton]

• Update formatter runner to implement RubyLsp::Requests::Support::Formatter interface, implementing run_formatting
• Update to register addon with global state, similar to the built-in Rubocop formatter in ruby-lsp
• This allows the addon to work with version 0.17.1 of ruby-lsp, the latest version of ruby-lsp at time of writing

[cirdes]

I'm trying to make rubyfmt work with ruby-lsp on devcontainers but it's not working. I'm using ruby-lsp (0.17.2).

I have rubyfmt installed and can run it on the terminal and everything seems to be fine on ruby-lsp

This PR could solve my issue.

[schpet]

just tried setting this up, and vscode shows me the following error:

Error loading addons: Ruby Fmt Formatter: wrong number of arguments (given 2, expected 0)

hoping confirmed this PR resolves it via

  # Gemfile
  gem 'ruby-lsp-rubyfmt', :git => 'https://github.com/aaronlifton/ruby-lsp-rubyfmt.git', :branch => 'main'

[cirdes]

@jscharf , any change to get this merged?

[jscharf]

@cirdes I would love to get this merged! One of my problems is that I've been away from this type of work for a while so I need to come up testing steps so I can test this locally before merging. I will try to get to this but any context you or others can help provide to get me caught up on what's changed in Ruby LSP integrations in the last year or so would be a big help.