test(engineio): mock http/ws connections (#444) #1143

Job	Run time
format	13s
udeps	56s
test	1m 41s
examples	32s
msrv	19s
feature_set	4m 40s
rust-clippy-analyze	48s
engine_io (v3)	34s
socket_io (v4)	39s
engine_io (v4)	38s
socket_io (v5)	40s
socket_io (v5-msgpack)	46s
adapter (v4, fred-e2e)	1m 21s
adapter (v4, redis-e2e)	1m 10s
adapter (v4, redis-cluster-e2e)	1m 12s
adapter (v4, fred-cluster-e2e)	1m 26s
adapter (v4-msgpack, fred-e2e)	2m 4s
adapter (v4-msgpack, redis-e2e)	1m 18s
adapter (v4-msgpack, redis-cluster-e2e)	1m 20s
adapter (v4-msgpack, fred-cluster-e2e)	1m 10s
adapter (v5, fred-e2e)	1m 19s
adapter (v5, redis-e2e)	1m 19s
adapter (v5, redis-cluster-e2e)	1m 11s
adapter (v5, fred-cluster-e2e)	1m 21s
adapter (v5-msgpack, fred-e2e)	1m 20s
adapter (v5-msgpack, redis-e2e)	1m 13s
adapter (v5-msgpack, redis-cluster-e2e)	1m 12s
adapter (v5-msgpack, fred-cluster-e2e)	1m 13s
all_passed	1s
	33m 36s

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