feat(testing): mock node and provider service implementation

[cloud-j-luna]

Is your feature request related to a problem? Please describe.

The absence of mock node and provider instances makes it difficult to validate Protobuf-generated code schemas efficiently during development and testing.

Describe the solution you'd like

Implement the different gRPC services and handle the queries according to what is expected without all the complex workflow. The node and provider should be based in a fixed predictable state.

Describe alternatives you've considered

Alternatively to running these against a testnet. We need to be able to integrate this validations in our CI workflow and detect issues early on in development.

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Additional context

No response

[cloud-j-luna]

Bulk development complete. Tests being written to validate types against the mock data provided by the mock node and provider.