`Decimal` type: constuctors, comparisons, and arithmetic #22628

Job	Run time
Cancel Previous Runs	4s
Engine (GraalVM CE) (linux, x86_64)	18m 20s
Engine (GraalVM CE) (macos, x86_64)	1h 32m 25s
Engine (GraalVM CE) (windows, x86_64)	6m 49s
Engine (Oracle GraalVM) (linux, x86_64)	20m 8s
Scala Tests (GraalVM CE) (linux, x86_64)	21m 7s
Scala Tests (GraalVM CE) (macos, x86_64)	46m 0s
Scala Tests (GraalVM CE) (windows, x86_64)	45m 24s
Scala Tests (Oracle GraalVM) (linux, x86_64)	21m 21s
Standard Library Tests (GraalVM CE) (linux, x86_64)	20m 8s
Standard Library Tests (GraalVM CE) (macos, x86_64)	36m 27s
Standard Library Tests (GraalVM CE) (windows, x86_64)	20m 17s
Standard Library Tests (Oracle GraalVM) (linux, x86_64)	17m 7s
Verify License Packages (linux, x86_64)	2m 31s
	6h 8m 8s

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