Implement a gRPC service to generate cells for RunMe

[jlewi]

• Define a GRPC service that will take a RunMe notebook and generate cells to be inserted into that notebook
  • The gRPC service is being defined in Define AI GRPC service to support using AI to generate cells stateful/runme#573
• Define converters to and from RunMe protos to Foyle Protos
• Make a copy of RunMe's ULID generator code so we can generate cell ids in the format RunMe expects
  • RunMe"s ULID generator code is defined in an internal package so we can't just reuse it.
• Related to tn_004.md runme integration

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[jlewi]

Now that runme has merged stateful/runme#573 with the generated protos we can remove the replace directive and we can build this