feat(iroha-connector): add prometheus exporter to the plugin

[hanxu12]

Is your feature request related to a problem? Please describe. Prometheus exporter metrics integration is not implemented.

Describe the solution you'd like Implement prometheus exporter metrics integration for the iroha connector.

Describe alternatives you've considered N/A

Additional context N/A

[TheJagpreet]

@ashnashahgrover

[ashnashahgrover]

Please assign me.

[RafaelAPB]

Until there is an explicit need for this feature, this issue is closed.