[CALCITE-6730] Add CONVERT function(enabled in Oracle library) #14405

Job	Run time
Windows (JDK 17)	12m 14s
Windows (JDK 8)	12m 13s
Linux (JDK 11, Pacific/Chatham Timezone)	10m 23s
Linux (JDK 8, latest Guava, America/New_York Timezone)	12m 18s
Linux (JDK 8, oldest Guava, America/New_York Timezone)	11m 16s
Windows (JDK 21)	12m 12s
ErrorProne (JDK 11, latest Guava)	4m 0s
Linux (JDK 11, Avatica main)	14m 16s
CheckerFramework (JDK 11)	10m 45s
CheckerFramework (JDK 11, oldest Guava)	11m 7s
Linux (JDK 21)	12m 13s
Linux (JDK 17)	10m 8s
Linux (JDK 23)	10m 7s
macOS (JDK 21)	12m 15s
Linux (JDK 8) Slow Tests	0s
Druid Tests	6m 48s
	2h 42m 15s

Provide feedback