Implement single-node database server using Protobuf

[chungquantin]

Is your feature request related to a problem? Please describe. Apart from being as an embedded storage, SolomonDB can support Gremlin query on a single-node database server. We will build client libraries for high level languages to communicate with the server via gRPC. The server should be containerized for a simple setup and installation.

Describe the solution you'd like Need to parse Gremlin command from string format to bytecode format and send to SolomonDB server for Step execution.