Introduce ServerTiming for queries #1981

Loadtest Results

param	main	v11.2.0	head
bytes_in.mean	1030.4485877419029	1030.347473832528	1030.4101041666668
bytes_in.total	20393608	20475065	19783874
bytes_out.mean	3848.2474357030974	3849.60220410628	3849.833072916667
bytes_out.total	76160665	76499295	73916795
duration	60019342470	60002352060	60000691274
errors.0	400 Bad Request	400 Bad Request	400 Bad Request
latencies.50th	1179503	1185967	1222986
latencies.90th	3503199	3737112	3639670
latencies.95th	20650226	20396286	21229241
latencies.99th	21555762	21537948	21958581
latencies.max	42381621	37487061	38035637
latencies.mean	3031126	3017512	3123532
latencies.min	153614	160315	178617
latencies.total	59989020488	59964003648	59971828914
rate	329.7436990398939	331.1870171377412	319.99631324780927
requests	19791	19872	19200
status_codes.200	10796	10839	10473
status_codes.201	1799	1807	1746
status_codes.204	5397	5419	5235
status_codes.400	1799	1807	1746
success	0.909100096003233	0.9090680354267311	0.9090625
throughput	299.76454200818205	301.0639728977296	290.88327160847723
wait	1098505	1506343	2759263