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/actions/discussions/annotations.lua

@@ -64,3 +64,10 @@
 ---@class DiscussionData
 ---@field discussions Discussion[]
 ---@field unlinked_discussions UnlinkedDiscussion[]
+
+---@class WinbarTable
+---@field name string
+---@field resolvable_discussions number
+---@field resolved_discussions number
+---@field resolvable_notes number
+---@field resolved_notes number