feat: add Factories plugin

[yonadaa]

Solves #704.

This PR adds Factories into MUD. Users define a template.config (which is strongly typed based via codegen on mud.config), like so:

const factoryConfig = templateConfig({
  templates: {
    Example: {
      Statics: {
        v1: 1n,
        v2: 1,
        v3: "wasd",
        v4: "0x71C7656EC7ab88b098defB751B7401B5f6d8976F",
        v5: true,
        v6: "E1",
        v7: "E1",
      },
      Counter: { value: 2n },
    },
  },
});

The templates are created in PostDeploy. Once the world is deployed, a method can be used to create instances from the template data.

Outstanding issues

• This could perhaps be more cleanly implemented as some plugin.
• We should replace the type codegen by deriving the types from the config in Typescript.
• Tables can have different composite keys, so it's unclear how to generate a new unique key for each, per instance.

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[alvrs]

Very much like this, but we should wait until the plugin foundation is done. Will close for now, but we should reopen and update this once plugins are ready.