Add support for quantile and quantileIf functions #299

Job	Run time
3.7 CH=23.8.4.69	1m 10s
3.7 CH=22.5.1.2079	1m 0s
3.7 CH=19.3.5	48s
3.7 CH=18.14.9	58s
3.8 CH=23.8.4.69	33s
3.8 CH=22.5.1.2079	40s
3.8 CH=19.3.5	41s
3.8 CH=18.14.9	34s
3.9 CH=23.8.4.69	34s
3.9 CH=22.5.1.2079	34s
3.9 CH=19.3.5	36s
3.9 CH=18.14.9	35s
3.10 CH=23.8.4.69	34s
3.10 CH=22.5.1.2079	36s
3.10 CH=19.3.5	30s
3.10 CH=18.14.9	30s
3.11 CH=23.8.4.69	36s
3.11 CH=22.5.1.2079	34s
3.11 CH=19.3.5	39s
3.11 CH=18.14.9	36s
3.12 CH=23.8.4.69	59s
3.12 CH=22.5.1.2079	1m 3s
3.12 CH=19.3.5	51s
3.12 CH=18.14.9	59s
Indicate completion to coveralls.io	11s
	17m 21s

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