Allow multiple mock responses of same type

[kwtalley]

Summary

Mock query responses only support one response per message type

Problem Definition

When writing contract tests using the new proto based messages, queries are handled with mock responses, however, the mocked response can only be set once per query type via proto path here. This does not support multiple queries of the same type within a contract execution, i.e. - querying for multiple Markers sequentially within a single contract invocation.

Proposal

Ideally, use a test framework to mock the querier rather than extending the existing mock_response

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