Add a command to go to the schema for the current file

[RedBeard0531]

It isn't clear where the files are stored, so going there manually isn't easy. Even if it was, it would be nice to automate. Ideally it should go directly to the relevant section for whatever the cursor is on. Maybe that should even be the gotoDefinition action?

[chemzqm]

It's fetched by language server, you can send feature request to yaml language server.