Add missing faulthandler.enable

Author: msimacek

graalpython/lib-graalpython/faulthandler.py

@@ -40,6 +40,12 @@
 _enabled = True
 
 
+@__graalpython__.builtin
+def enable(file=None, all_threads=True):
+    global _enabled
+    _enabled = True
+
+
 @__graalpython__.builtin
 def disable():
     global _enabled