Add support for "type" of selection range.

[ckipp01]

Describe the feature

Metals now has support for the user to visual select a piece of code and then get the type of everything selected.

Potential ways to implement?

This is piggy-backing on the current way hover requests are done. The only difference is that a range is sent in instead. You can see an example of how this is done here in nvim-metals: https://github.com/scalameta/nvim-metals/pull/232/files

This was added in: scalameta/metals#3178