* LSP: Add tests & use nvim_buf_get_lines in locations_to_items
This is to add support for cases where the server returns a URI in the
locations that does not have a file scheme but needs to be loaded via a
BufReadCmd event.
* LSP: Don't iterate through all lines in locations_to_items
* fixup! LSP: Don't iterate through all lines in locations_to_items
* fixup! fixup! LSP: Don't iterate through all lines in locations_to_items
* fixup! fixup! fixup! LSP: Don't iterate through all lines in locations_to_items