Porting Code Generation to substrait-packaging

[vbarua]

Based on the discussion in substrait-io/substrait#925 we are planning on extracting all artifact generation in substrait-python to the new substrait-packaging repository. That repository will generate and publish Python package which substrait-python can then import.

Artifact Checklist

• ANTLR Bindings
• Protobuf Bindings
• Yaml Bindings