Support copy action in ExtServices

1. Implemented CopyCodeActivity to copy the text from the incoming intent
2. Support ConversationAction of type == "copy"

Test: 1. atest SmartActionsHelperTest
      2. Send myself a message "Authentication code: 12345", observe
         the copy action. Tap on it, observe a toast and verify that
         the code is copied

BUG: 126193140
Change-Id: I73ac3b36413fd5f632951b48910c557a22b20c52