Winbar Support + Notes and Discussions; Help Popup + Auto-Open (#133)

- Adds support for toggling between discussions and notes views
- Deprecates the split view shared with both discussions and notes at the same time
- Adds winbar to discussion split, with metadata about resolved and unresolved discussions
- Adds help popups with information about keybindings for all views
- Modifies highlights in discussion tree and default symbol for unresolved discussions

This is a MINOR version bump as the default behavior of the discussion tree is changed slightly. Existing configurations should still function.

lua/gitlab/reviewer/diffview.lua

@@ -39,6 +39,12 @@ M.open = function()
       end
     end,
   })
+
+  if state.settings.discussion_tree.auto_open then
+    local discussions = require("gitlab.actions.discussions")
+    discussions.close()
+    discussions.toggle()
+  end
 end
 
 M.jump = function(file_name, new_line, old_line)