* upgrade libp2p to 0.50.0
* on_swarm_event and on_connection_handler_event
* replace `Swarm::new` with `Swarm::with_threadpool_executor`
* on_swarm_event and on_connection_handler_event part 2
* on_swarm_event and on_connection_handler_event part 3
* on_swarm_event and on_connection_handler_event part 4
* update libp2p
* libp2p 0.50.0
* rename OutboundQueryCompleted to OutboundQueryProgressed
refs https://github.com/libp2p/rust-libp2p/pull/2712
* remove unused var
* accumulate outbound_query_records until query is finished
* format code
* use p_handler instead of new_handler
https://github.com/paritytech/substrate/pull/12734#discussion_r1027640610
* pass ListenFailure to kademlia
https://github.com/paritytech/substrate/pull/12734#discussion_r1034716664
* use tokio executor in tests
https://github.com/paritytech/substrate/pull/12734#discussion_r1039291776
* use chrono Local::now
instead of deprecated Local::today
* remove unused vars from request_responses tests
* attempt to fix pallet UI tests
* restart CI
* restart CI
* restart CI
* restart CI
* restart CI
* restart CI
* restart CI
* restart CI