Implement list semtype in runtime #7773

Job	Run time
Build Ballerina Lang	3m 30s
Build Ballerina Distribution	45m 16s
Build Stdlib Level (1)	4m 36s
Build Stdlib Level (3)	5m 17s
Build Stdlib Level (2)	12m 35s
Build Stdlib Level (4)	16m 37s
Build Stdlib Level (5)	39m 24s
Build Stdlib Level (6)	18m 14s
Build Stdlib Level (7)	3m 6s
Build Stdlib Level (8)	35m 49s
Build Stdlib Level (9)	4m 15s
	3h 8m 39s

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