Complete rewrite of Windows exec wrapper (#21510)

* supports pipelining for faster execution
* supports become (runas), creates interactive subsession under WinRM batch logon
* supports usage of arbitrary module_utils files
* modular exec wrapper payload supports easier extension
* integrates async wrapper behavior for pipelined/become'd async
* module_utils are loaded as true Powershell modules, no more runtime modifications to module code

lib/ansible/plugins/shell/__init__.py

@@ -172,3 +172,7 @@ class ShellBase(object):
             cmd += ' %s %s' % (self._SHELL_AND, cmd_to_append)
 
         return cmd
+
+    def wrap_for_exec(self, cmd):
+        """wrap script execution with any necessary decoration (eg '&' for quoted powershell script paths)"""
+        return cmd