Generate forms for resource actions in Livebook

Aside from generating documentation, it could significantly increase the usefulness of the Livebook integration by generating cells that allow interaction with resources through their actions.

The issue does not name files or tests; start by locating the Livebook integration and its existing documentation or cell-generation entry points. Determine which resource actions should be exposed and how generated cells should present forms, then verify that the resulting cells allow interaction with those actions.

Written by the indexing model from the issue text.