Implement ZLS into plugin

[TheStachelfisch]

Recently I came about this post from Jetbrains which explains how LSP can now be integrated into plugins for additional features.
This could finally make this plugin work similarly to how other ZIG plugins for instance in VScode, Sublime Text and Vim work.

[MarioAriasC]

LSP support is limited, for now, to paid versions of the IDEs (e.g., IntelliJ IDEA Ultimate, Clion).

I'm already looking into this, but my time is very limited, and there are other features that are more urgent at the moment.