Refactor runtime type checker concurrency model #8891

Job	Run time
Build Ballerina Lang	7m 28s
Build Ballerina Distribution	1h 8m 55s
Build Stdlib Level (10)	13m 38s
Build Stdlib Level (2)	13m 4s
Build Stdlib Level (1)	4m 10s
Build Stdlib Level (3)	9m 29s
Build Stdlib Level (4)	15m 52s
Build Stdlib Level (5)	42m 30s
Build Stdlib Level (6)	26m 7s
Build Stdlib Level (7)	36m 3s
Build Stdlib Level (9)	5m 46s
Build Stdlib Level (8)	1h 30m 3s
	5h 33m 5s

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