feat: define TaskContextProxy#disconnect

There was previously no way to make a task context proxy
completely stop working.

Author: doudou

lib/orocos/async/task_context_proxy.rb

@@ -574,6 +574,11 @@ def reconnect(wait_for_task = false)
             wait if wait_for_task == true
         end
 
+        def disconnect
+            @resolve_timer.stop
+            remove_all_listeners
+        end
+
         main_thread_call def property(name, options = Hash.new)
             name = name.to_str
             options,other_options = Kernel.filter_options options, wait: @options[:wait]