pallet-xcm: add support to authorize aliases #13332

Job	Run time
preflight / preflight	39s
preflight / ci-versions	1m 13s
test-linux-stable-int	10m 29s
test-linux-stable (1/3, parity-large)	42m 5s
test-linux-stable-runtime-benchmarks	33m 16s
test-linux-stable (1/3, parity-oldlinux)	40m 37s
test-linux-stable (2/3, parity-large)	30m 12s
test-linux-stable (2/3, parity-oldlinux)	30m 42s
test-linux-stable (3/3, parity-large)	29m 17s
test-linux-stable (3/3, parity-oldlinux)	30m 21s
test-linux-stable-no-try-runtime (1/2)	43m 29s
test-linux-stable-no-try-runtime (2/2)	32m 5s
All tests passed	1s
	5h 24m 26s

Provide feedback