feat: add support for map:size function #4971

Job	Run time
build	1m 48s
tests (RuntimeTestsNoParallelism)	1m 7s
tests (RuntimeTests)	1m 14s
tests (JavaAPITest)	51s
tests (SparkRuntimeTestsDataFramesDeactivated)	3m 50s
tests (FrontendTests)	53s
tests (RuntimeTestsNoInlining)	1m 14s
tests (SparkRuntimeTests)	3m 51s
tests (NativeFLWORRuntimeTestsNativeDeactivated)	48s
tests (StaticTypeTests)	50s
tests (NativeFLWORRuntimeTestsDataFramesDeactivated)	56s
tests (NativeFLWORRuntimeTestsParallelismDeactivated)	47s
tests (DeltaUpdateRuntimeTests)	7m 9s
tests (XQueryTests)	48s
tests (MLTests)	2m 1s
tests (XMLTests)	1m 4s
tests (IcebergUpdateRuntimeTests)	47s
tests (Bugs)	1m 38s
tests (SparkRuntimeTestsNativeDeactivated)	4m 3s
tests (MLTestsNativeDeactivated)	2m 3s
tests (SparkRuntimeTestsParallelismDeactivated)	1m 21s
tests (NativeFLWORRuntimeTests)	48s
	39m 51s

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