OpenAPI support

[sverhoeven]

Your model might be written in a language which does not have gRPC support.
In this case, you can use the OpenAPI specifcation to wrap your model in a JSON web service.

Refs #101

TODO

• Wrap the generated Python client in a BMI class grpc4bmi.bmi_openapi_client.BmiOpenApiClient
• Apptainer client which can talk to openapi powered web service
• Docker client whcih can talk to openapi powered web service
• Call BMI class from generated Python server
• Call BMI methods from generate Julia server
• Make Python client and server part of grpc4bmi Python package?
• Annotate bmi.proto for nicer paths and methods (not everything POST, get_* methods should use GET request method)
• Document when languages which don't have a server stub generator, ask developer to make web service in that language which follows proto/grpc4bmi/bmi.swagger.yaml spec.
• Suggest calling model from another language which has gRPC support. See Add Julia support to gprc4bmi #144 for troubles with multi lang setup.

[sonarqubecloud]

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[sverhoeven]

Or do we make a new Python package with openapi specification?

[sverhoeven]

Created https://github.com/eWaterCycle/remotebmi for it