Use codable models in API

This MR contains !9 (merged) and !11 (merged) (make sure to merge them before reviewing this MR)

• Update IdentityMaker to return Identity model.
• Update ConnectionMaker to accept Identity model.
• Use Message model in MessageListener.
• Use RestlikeMessage model in RestlikeRequestSender.
• Use MessageSendReport in MessageDeliveryWaiter.
• Use [Int] for rounds in MessageDeliveryWaiter.Result.delivered.
• Use Identity model in ContactFromIdentityProvider.
• Use Fact model in ContactFactsProvider.
• Use Fact model in ContactFactsSetter.

requested review from @ahmedshehata01

assigned to @darrarski.xx

added 7 commits

• 8bdd3897...b5ffe08c - 6 commits from branch main
• 9c8cba1b - Merge branch 'main' into feature/api-models

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changed the description

mentioned in merge request !14 (merged)

mentioned in commit fa1aa40b

merged