single schema object for to be returned for all method

[avanishtiwari38]

Currently SchemaRegistryClient method have different schema object for different method for example: get_latest_version return you schema with references as array of json as below

[{'name': 'com.test.common.event.Eventdata', 'subject': 'com.test.common.event.Eventdata', 'version': 5}, {'name': 'com.test.schema.user.Details', 'subject': 'com.test.schema.user.Details', 'version': 2}]

While get_schema method return you schema with references as array of SchemaReference object as below

[<confluent_kafka.schema_registry.schema_registry_client.SchemaReference object at 0x1037a9790>, <confluent_kafka.schema_registry.schema_registry_client.SchemaReference object at 0x1037a97f0>]

Which get it difficult to use like need to make different function one for to get schema id and other to get schema object with id that has SchemaReference object.

As it is more like to fetch schema with subject name rather than schema_id because we can map our schema with topic and reuse topic name to fetch the schema.

So this PR will make a single universal schema object that will be returned by any method call.

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[rayokota]

Subsumed by https://github.com/confluentinc/confluent-kafka-python/pull/1852