address: Create common functionality to remove code duplicate

[lexnv]

This pattern is implemented in multiple places:

litep2p/src/protocol/libp2p/kademlia/routing_table.rs

Lines 145 to 156 in e0b7118

	// TODO: this has to be moved elsewhere at some point
	let addresses: Vec<Multiaddr> = addresses
	.into_iter()
	.filter_map(|address| {
	let last = address.iter().last();
	if std::matches!(last, Some(Protocol::P2p(_))) {
	Some(address)
	} else {
	Some(address.with(Protocol::P2p(Multihash::from_bytes(&peer.to_bytes()).ok()?)))
	}
	})
	.collect();