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/light/Cargo.toml

@@ -21,7 +21,7 @@ codec = { package = "parity-scale-codec", version = "3.0.0", features = [
     "derive",
 ] }
 futures = "0.3.21"
-libp2p = "0.49.0"
+libp2p = "0.50.0"
 log = "0.4.16"
 prost = "0.11"
 sp-blockchain = { version = "4.0.0-dev", path = "../../../primitives/blockchain" }