Add the first-class concept of forms that can be used to respond to interactions similar to message templates. Under the hood, they use Discord modals and can store responses or run flows on them.

Open questions:

• Should forms be a separate entity similar to message templates or be part of the flow?
  • Message templates are different from forms because their can be permanent instances of messages but modals are always temporary.
  • I still don't like the idea of keeping all flow execution state in memory until the form is submitted :/