chore: returning seqs in libwaku as comma separated strings

[gabrielmer]

Description

In libwaku, when returning sequences as outputs, in some places we are returning the sequence as a comma-separated string such as in

nwaku/library/waku_thread/inter_thread_communication/requests/peer_manager_request.nim

Lines 79 to 90 in 18c375a

	of GET_ALL_PEER_IDS:
	## returns a comma-separated string of peerIDs
	let peerIDs =
	waku.node.peerManager.wakuPeerStore.peers().mapIt($it.peerId).join(",")
	return ok(peerIDs)
	of GET_PEER_IDS_BY_PROTOCOL:
	## returns a comma-separated string of peerIDs that mount the given protocol
	let connectedPeers = waku.node.peerManager.wakuPeerStore
	.peers($self[].protocol)
	.filterIt(it.connectedness == Connected)
	.mapIt($it.peerId)
	.join(",")

while in others we return a string wrapped with the [ ] characters, representing an array

For the sake of simplicity and consistence - and mainly so the parsing client-side can be the same in all cases - I propose to return all sequences as comma-separated strings

Changes

• returning output of RETRIEVE_LISTENING_ADDRESSES as comma-separated string
• returning output of GET_BOOTSTRAP_NODES as comma-separated string

Issue

#3115

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:3121

Built from c492bb4

[Ivansete-status]

LGTM! Thanks for it! 💯

[NagyZoltanPeter]

Looks great!