Description

As part of implementing the new Schemas & Permissions logic, the existing Schema storage and APIs need to be migrated to the new design.

Tasks

• Remove types that are no longer necessary
• Remove extrinsics related to schema names
• Remove extrinsics for managing schemas that are not compatible with the updated definition of a Schema
• Add new schema extrinsics, compatible with Intents
• Remove custom RPC methods from the node, but preserve any runtime APIs that those methods call, so that old nodes will still be able to call into the new runtime