CLPR: Basic Interledger Contract Call

With stubbed out connectors approving everything and all payments managed by submitting nodes, get a basic proof of concept end-to-end application remote call to go through stubbed out middleware and messaging layer.

The issue names no files, tests, or entry points. Start by locating the connector, submitting-node, middleware, and messaging components, then trace how a remote application call could pass between them. Done means a basic end-to-end proof of concept succeeds with connectors stubbed to approve requests and payments managed by submitting nodes.

Written by the indexing model from the issue text.