Refactor of GetPeerAddress method in messaging/transport

[jepenven-silabs]

Problem

All of the messaging/transport layer use GetPeerAddress to obtain the destination IP of a node in Unicast communication.
However Multicast/Group communication use the same method.

Proposed Solution

Either one of the two following solution :

• Refactor GetPeerAddress for GetDestinationAddress that will return either a unicast IP or a multicast ip base on the context
• Add a second method to retrieve multicast ip based on the groupID and add necessary check to choose between the two.

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