feat(prospective-parachains) handle GetMinimumRelayParents signal

[DanielDDHM]

Changes

Parachain Validity and Dispute Handling: Improvements in how parachain candidates are attested and how dispute statements are handled.
Answer Minimum Relay Parents Request: A new function to retrieve and process relay parent data for parachains.
Enhanced Encoding: Updates to the encoding functions for improved compatibility with Polkadot’s inherent data requirements.

Tests

Unit Tests: Core logic is tested in isolation using testify for assertions

go test -tags integration github.com/ChainSafe/gossamer

Issues

4312

[CLAassistant]

All committers have signed the CLA.

[EclesioMeloJunior]

Hey @DanielDDHM, the issue #4312 refers to a function that should be implemented as part of the prospective-parachains subsystem, and it should be addressed after merging PR #4325. So I will close it since it is not implemented correctly.

For context, the function answer_minimum_relay_parents_request is a routine that is executed when the ProspectiveParachains subsystem receive a message ProspectiveParachainsMessage::GetMinimumRelayParents from CandidateBacking subsystem, and here you have introduced the function in the wrong place.