Enforce TTL for peer data record

[NIC619]

What was wrong?

Open this issue to track the TODO here:

py-libp2p/libp2p/peer/peerstore.py

Lines 95 to 101 in da10fc8

	def add_addrs(self, peer_id: ID, addrs: Sequence[Multiaddr], ttl: int) -> None:
	"""
	:param peer_id: peer ID to add address for
	:param addrs:
	:param ttl: time-to-live for the this record
	"""
	# Ignore ttl for now

as brought up in the comment in: #360 (comment)

How can it be fixed?

When requested, check if the peer data has expired. Delete it and raise PeerStoreError.