feat(statement-distribution): Implement handle_incoming_manifest_common and acknowledgement_and_statement_messages

[EclesioMeloJunior]

Description

Handles the common part of incoming manifests of both types (full & acknowledgement). Basic sanity checks around data, importing the manifest into the grid tracker, finding the sending peer's validator index, reporting the peer for any misbehavior, etc.

Acceptance criterias

[] Method we should implement: handle_incoming_manifest_common
[] Implement: acknowledgement_and_statement_messages
[] Unit tests