Refactor semtype creation #8723

Job	Run time
Build Ballerina Lang	8m 6s
Build Ballerina Lang	8m 6s
Build Ballerina Distribution	1h 11m 55s
Build Ballerina Distribution	1h 7m 12s
Build Stdlib Level (3)	8m 57s
Build Stdlib Level (3)	8m 57s
Build Stdlib Level (1)	4m 32s
Build Stdlib Level (1)	4m 32s
Build Stdlib Level (2)	12m 9s
Build Stdlib Level (2)	12m 9s
Build Stdlib Level (4)	17m 20s
Build Stdlib Level (4)	17m 20s
Build Stdlib Level (5)	41m 26s
Build Stdlib Level (5)	41m 26s
Build Stdlib Level (7)	35m 20s
Build Stdlib Level (7)	35m 20s
Build Stdlib Level (8)	33m 23s
Build Stdlib Level (8)	33m 23s
Build Stdlib Level (9)	4m 33s
Build Stdlib Level (9)	4m 33s
Build Stdlib Level (6)	26m 28s
Build Stdlib Level (6)	26m 28s
	8h 43m 35s

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