lib-cove performance opportunities

[jpmckinney]

• See Performance option: Reduce traversals of entire data OpenDataServices/lib-cove#65 which refactors get_json_data_generic_paths, get_fields_present_with_examples, get_additional_fields_info, fields_present_generator
• The other hotspot (outside jsonschema, which is the majority of the time) is get_additional_codelist_values. It calls _generate_data_path and then rejects/ignores a bunch of its output. It is the only function to call that function, so there's an opportunity to merge the path_no_num and not in schema_obj.extended_codelist_schema_paths logic into _generate_data_path.
• We can cache the our_validator = validator( calls. For example: Allow lib-cove-* libraries to provide their own function for returning a validator. Then, have it cache similarly to how SchemaOCDS is cached in Kingfisher Process.

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curl -Lo 1__1__5.zip https://github.com/open-contracting/standard/archive/1__1__5.zip

python -m cProfile -o code.prof -m libcoveocds --skip-aggregates --additional-checks none --standard-zip 1__1__5.zip 2017_0.json; gprof2dot -f pstats code.prof | dot -Tpng -o output.png; open output.png