chore(ci): add ci to pydgraph

[joshua-goldstein]

See https://github.com/joshua-goldstein/pydgraph/actions/runs/4526909926/jobs/7972368806 for sample workflow.

Remarks

• Protobuf requires <4.0.0, otherwise build fails. Minimum required is unclear.
• gRPC works with 1.51; in different places, the minimum is 1.18 and 1.38
• Readme says "To avoid issues when adding composite credentials or when using client authorization, please install gRPC version 1.19.0"
• Tests run using Python 3.11.2. Dependency / build problems seem to arise because of protobuf and grpc libraries, not Python versions
• I have removed tox while we get CI running. We can revisit this later. Before implementing tox, we should get code coverage working.

TODO (next PR)

• We will need to update requirements.txt and possibly regenerate protobufs for next release

[CLAassistant]

All committers have signed the CLA.

[joshua-goldstein]

Minimal setup to run tests. Run pip install -r requirements.txt with

grpcio==1.51.3
protobuf==3.17.3

in the requirements file. To run tests, we also need pip install setuptools==67.6.0. Then run bash scripts/local-test.sh. This is on Python 3.11.2. Also note that Dgraph binary must be located in $GOPATH/bin for ACL tests to work.

[skrdgraph]

👍