Extension click handler

Property	Type	Description
type	'extensionHandler'	Specifies the type of click handler.
packageId	string	Package Id in which the action is registered in.
extensionName	string	Name of the extension in which the action is registered in.
action	string	Name of the action to be triggered on click.
parameters	JSON object	A JSON object whose values can be of type boolean, null, number or Interpolated strings. The object will be passed to the action when the action is called.