feat(plugins): add display name change event to Channel (#6594)

Reviewed-by: Mm2PL <mm2pl+gh@kotmisia.pl>

docs/lua-meta/globals.lua

@@ -244,6 +244,12 @@ function c2.Channel:is_vip() end
 ---@return string
 function c2.Channel:__tostring() end
 
+--- Callback when the channel display name changes.
+---
+---@param cb fun()
+---@return c2.ConnectionHandle hdl
+function c2.Channel:on_display_name_changed(cb) end
+
 --- Finds a channel by name.
 --- Misc channels are marked as Twitch:
 --- - /whispers
@@ -264,6 +270,37 @@ function c2.Channel.by_twitch_id(id) end
 
 -- End src/controllers/plugins/api/ChannelRef.hpp
 
+-- Begin src/controllers/plugins/api/ConnectionHandle.hpp
+
+
+
+---@class c2.ConnectionHandle
+---This type represents a handle to a registration of a callback for an event handler.
+---Conceptually, the event has a _connection_ to the callback/handler.
+---This handle can be used to modify that connection.
+---It does not automatically disconnect the connection when it's destroyed (in `__gc`) -
+---`disconnect()` has to be called manually.
+c2.ConnectionHandle = {}
+
+---Disconnect the signal
+function c2.ConnectionHandle:disconnect() end
+
+---Block events on this connection
+function c2.ConnectionHandle:block() end
+
+---Unblock events on this connection
+function c2.ConnectionHandle:unblock() end
+
+---Is this connection currently blocked?
+---@return boolean is_blocked
+function c2.ConnectionHandle:is_blocked() end
+
+---Is this connection still connected?
+---@return boolean is_connected
+function c2.ConnectionHandle:is_connected() end
+
+-- End src/controllers/plugins/api/ConnectionHandle.hpp
+
 -- Begin src/controllers/plugins/api/HTTPResponse.hpp
 
 ---@class c2.HTTPResponse