Collator Protocol V4: collator side implementation

[serban300]

Related to: #11903

Draft PR: #12172

Things remaining to be done:

1. Related to CollatorProtocolMessage (defined in polkdot/node/network/protocol/src/lib.rs):

• We possibly need to remove the CollationSeconded variant. See: https://github.com/paritytech/polkadot-sdk/pull/12172/changes#r3595451352
• We need to add a claim_queue_offset field to CandidateFingerprint, so for each candidate in the AdvertiseSegment variant. It can be initialized with 0 for now, and than we can add the actual initialization logic later as a patch release

2. Adding backwards compatibility E2E tests:

• check that it works when the collator has v4 support and the validator supports only v2/v3