chore: add unreceived packets rpc

[lacsomot]

Description

ref: #7478

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• Wrote unit and integration tests.
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[DimitrisJim]

thanks, left some comments. Tests are also needed for the method!

[DimitrisJim]

Approving with this final change request! Tysm!

[damiannolan]

Thanks! Just made a suggestion on two api usages