Convert project to workspace with Tonic for gRPC.
This commit adds an RPC service to the dicebot, allowing external
applications to control it. The project was converted to a cargo
workspace to house the protobuf definitions in a common crate
(tenebrous-rpc), so that clients and servers can make use of these
protobuf definitions.
Co-Authored-By: projectmoon <projectmoon@noreply.git.agnos.is>
Co-Committed-By: projectmoon <projectmoon@noreply.git.agnos.is>
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