* on_chain/group_manager: use .async: (raises:[Exception]).
* bump nim-dnsdisc
* update nim-chronos to the latest state
* chat2.nim: catch any possible exception when stopping
* chat2bridge.nim: make it to compile after vendor bump
* ValidIpAddress (deprecated) -> IpAddress
* vendor/nim-libp2p additional bump
* libwaku: adapt to vendor bump
* testlib/wakunode.nim: adapt to vendor bump (ValidIpAddress -> IpAddress)
* waku_node: avoid throwing any exception from stop*(node: WakuNode)
* test_confutils_envvar.nim: ValidIpAddress -> IpAddress
* test_jsonrpc_store: capture exception
* test_rln*: handling exceptions
* adaptation to make test_rln_* to work properly
* signature enhancement of group_manager methods
