Refactor runtime type checker concurrency model #8882

Job	Run time
Build Ballerina Lang	8m 10s
Build Ballerina Distribution	1h 45m 21s
Build Stdlib Level (1)	5m 23s
Build Stdlib Level (10)	12m 53s
Build Stdlib Level (2)	13m 37s
Build Stdlib Level (3)	9m 47s
Build Stdlib Level (4)	16m 18s
Build Stdlib Level (5)	1h 45m 17s
Build Stdlib Level (6)	1h 45m 17s
Build Stdlib Level (7)	3m 20s
Build Stdlib Level (8)	1h 37m 23s
Build Stdlib Level (9)	5m 5s
	8h 7m 51s

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