upgrade libp2p to 0.50.0 (#12734)

* 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

substrate/client/network/common/Cargo.toml

@@ -24,7 +24,7 @@ codec = { package = "parity-scale-codec", version = "3.0.0", features = [
 ] }
 futures = "0.3.21"
 futures-timer = "3.0.2"
-libp2p = { version = "0.49.0", features = [ "request-response", "kad" ] }
+libp2p = { version = "0.50.0", features = ["request-response", "kad"] }
 linked_hash_set = "0.1.3"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../../utils/prometheus" }
 smallvec = "1.8.0"