Improve the transition trigger list view

Display event type namespaces in the transition trigger view.
Sort events type list in the transition trigger view.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

docs/releases/3.2.rst

@@ -715,6 +715,8 @@ Other changes
   outside of quotes are now interpreted as negation.
 - Add support for search field transformations.
 - Disable hiding page navigation on idle.
+- Display namespace in the transition trigger view.
+- Sort events list in the transition trigger view.
 
 
 Removals