Rethink our Operations API

[Filip Sodić]

When it comes to the most common happy path, our operations pretty well. You define your implementation, assign a type to it, and call it from the client (Queries through a hook, Actions directly or through a hook).

When we step off of this beaten, this get messy:

• Calling Queries directly from the client is weird and improperly typed: #1923 .
• Calling unspecified Queries from the client is improperly typed (discord)
• Calling Actions and Queries directly on the server is difficult, undocumented, and improperly typed: #1909.