Use opensouce library to replace the SchemaValidator in the openapi-validation model

[GavinChenYan]

The openapi-schema-validation opensource library use networknt/json-schema-validator for openapi schema validation.

We can use it directly instead of create new SchemaValidator for it.

https://github.com/mservicetech/openapi-schema-validation/tree/2.0.0

[stevehu]

Yes. We can remove the SchemaValidator as the openapi-schema-validation has the SchemaValidator already.