Not all intents are invokable with AppIntent

[cyb3rdog]

Issue description

The AppIntent rpc method does not seem to be able process and invoke all the available and existing intents, but just only few of them. To cherry pick some examples:
For example following intents can be invoked with API:

• knowledge_question
• explore_start
• intent_names_ask
  But following intents not, so they can be invoked as voice commands only:
• set_timer
• take_photo
• show_clock
  etc....

Also, there seems to be no public documentation for the AppIntentRequest params, so would be very appreciated to have some reference to it, if possible.