Add option to lint while typing instead of waiting for file save

[wJoenn]

While browsing through the source code I noticed that the getConfig method returns onSave: true.
Would it be possible to add a configuration so that we can change this settings to lint while writing the code instead of only checking after saving ?
Similar to ruby-lsp's behaviour with Rubocop

ruby.rb.-.the-hub.WSL_.Ubuntu.-.Visual.Studio.Code.2024-02-18.17-35-56.mp4

[nobodywasishere]

WIP implementation here. Won't be usable until after the next ameba release though.
https://github.com/nobodywasishere/vscode-crystal-ameba/tree/nobody/lint-on-type