feat(prospective-parachains): Implement HandleIntroduceSecondedCandidate

[rebonat0]

Changes

This PR introduces the HandleIntroduceSecondedCandidate func to prospectiveparachains package.

Notes:
currently there's no implementation for ImplicitView, reference is:
polkadot-sdk reference

Tests

go test -timeout 30s github.com/ChainSafe/gossamer/dot/parachain/prospective-parachains

Issues

closes #4308

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ EclesioMeloJunior
❌ rebonat0
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[CLAassistant]

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[EclesioMeloJunior]

should wait the merge of branch of #4337

[EclesioMeloJunior]

@rebonat0 this PR is unblocked now, sorry for the long delay!

[haikoschol]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.You have signed the CLA already but the status is still pending? Let us recheck it.

@rebonat0 please sign the CLA