Add a go-to-class feature for QL Code

[criemen]

Is your feature request related to a problem? Please describe.
Often, I want to go to the code for a specific QL class.
Right now, I have to use the global search (limited to qll and ql files), and search for the string "class " to get specific results.

Describe the solution you'd like
Integreate with the go to symbol in workspace functionality provided in VSCode (Ctrl+T).
A list of matches for the (partial) class name I entered and the files these classes are defined in would be awesome.

[aeisenberg]

Thanks for reporting. I'm going to close this one in favour of #637 since that is about a more general solution that fits in with the language server.

[adityasharad]

Go to Type Definition sounds like a more appropriate language server command in this case than Workspace Symbols which is referenced in #637.

[aeisenberg]

Go to type definition requires a source location and a URI. whereas workspace symbols just requires a query string. So, I think in this case the latter is more appropriate.