constants.py should not invoke schemaview

[cmungall]

This is called *when importing sssom-py:

sssom-py/sssom/constants.py

Lines 12 to 17 in 5490672

	HERE = pathlib.Path(__file__).parent.resolve()
	SCHEMA_YAML = pkg_resources.resource_filename(
	"sssom_schema", "schema/sssom_schema.yaml"
	)
	SCHEMA_VIEW = SchemaView(SCHEMA_YAML)

in general it's not a good idea to have logic executed when a package is imported. logic should only be done on specific invocation of that logic.

in this case it's particularly problematic as this invokes a network call...

[matentzn]

@hrshdhgd - can you remind me why a "network call" is required here?

[hrshdhgd]

I'm guessing the network call has to do with pkg_resources that calls the schema from sssom_schema. I do not fully understand this request. I was going to ask @cmungall for some clarification during our one-on-one but since you're not clear about it either, Chris could you please enlighten us both?