basic refine and accumulate flow

[xlc]

once we have all those, in theory we can have a fully functional (but insecure) network

• client to create work item and package
• RPC to submit work package from client to package builder
• CE133 submit work package from builder to guarantor implement CE133 Work-package submission #278
• CE134 share work package between guarantors
• refine work package and generate work bundle & work report
• CE135 share work bundle
• CE137 share EC shard from guarantors to assurers
• CE141 share assurance from assurers to block builders