Create an entity to publish without requiring the hypergraph provider

Often we just want to create an entity then publish it without integrating with the reactivity of the hypergraph store. Currently when using the hooks we require writing to a private space with a hypergraph space provider.

We could have something like

export class Todo extends Entity.Class<Todo>("Todo")({
   name: Type.String,
   description: Type.String,
})

const newTodo = Todo.create({ name: "X", description: "Y" })
await publishToPublicSpace({ entity: newTodo, spaceId: "Z" })

// Alternatively something like this
await publishToPublicSpace(Todo, { entity: { name: "X", description: "Y" }, spaceId: "Z" })

The issue names Entity.Class, Todo.create, hooks, the hypergraph space provider, and a proposed publishToPublicSpace entry point. Start by tracing the current provider-based entity creation and publishing flow. Done means an agreed API supports creating and publishing an entity without requiring the hypergraph provider, with tests covering the proposed usage.