splitting ArrowEnumerator into sub-classes #245

Job	Run time
Windows (JDK 17)	9m 24s
Windows (JDK 8)	10m 40s
Linux (JDK 8), latest Guava, America/New_York Timezone	3m 2s
Linux (JDK 8), oldest Guava, America/New_York Timezone	3m 29s
Linux (JDK 11), Avatica main	4m 50s
Linux (JDK 11), Pacific/Chatham Timezone	3m 27s
Linux (JDK 17)	3m 6s
Linux (JDK 19)	2m 59s
Error Prone (JDK 11), latest Guava	3m 33s
CheckerFramework (JDK 11)	10m 12s
CheckerFramework (JDK 11), oldest Guava	10m 19s
macOS (JDK 19)	6m 36s
Druid Tests	6m 49s
Linux (JDK 8) Slow Tests	0s
	1h 18m 26s

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