issue callbacks per item and retry fails

- now workers passes queue to task_executor so it can send back events per item and on retry attempt
- updated result class to pass along events to strategy
- base strategy updated to forward new events to callback
- callbacks now remove 'items' on final result but process them directly when invoked per item
- new callback method to deal with retry attempt messages (also now obeys nolog)
- updated tests to match new signature of task_executor

fixes #14558
fixes #14072

lib/ansible/plugins/callback/__init__.py

@@ -172,16 +172,8 @@ class CallbackBase:
         return item
 
     def _process_items(self, result):
-        for res in result._result['results']:
-            newres = self._copy_result_exclude(result, ['_result'])
-            res['item'] = self._get_item(res)
-            newres._result = res
-            if 'failed' in res and res['failed']:
-                self.v2_playbook_item_on_failed(newres)
-            elif 'skipped' in res and res['skipped']:
-                self.v2_playbook_item_on_skipped(newres)
-            else:
-                self.v2_playbook_item_on_ok(newres)
+        # just remove them as now they get handled by individual callbacks
+        del result._result['results']
 
     def _clean_results(self, result, task_name):
         if 'changed' in result and task_name in ['debug']:
@@ -346,15 +338,6 @@ class CallbackBase:
         if 'diff' in result._result:
             self.on_file_diff(host, result._result['diff'])
 
-    def v2_playbook_on_item_ok(self, result):
-        pass # no v1
-
-    def v2_playbook_on_item_failed(self, result):
-        pass # no v1
-
-    def v2_playbook_on_item_skipped(self, result):
-        pass # no v1
-
     def v2_playbook_on_include(self, included_file):
         pass #no v1 correspondance
 
@@ -366,3 +349,7 @@ class CallbackBase:
 
     def v2_playbook_item_on_skipped(self, result):
         pass
+
+    def v2_playbook_retry(self, result):
+        pass
+