Deletes unused CachingSupplier #755

Job	Run time
Pre-compile Checks / Basic QA	9m 54s
Default (Java 8) / Compile	42m 46s
Default (Java 8) / Test packaging/licensing	34m 18s
Default (Java 8) / E2E (group 1)	2h 17m 51s
Default (Java 8) / E2E (group 2)	2h 43m 43s
Default (Java 8) / Test (module: core)	13m 42s
Default (Java 8) / Test (module: python)	32m 24s
Default (Java 8) / Test (module: table)	37m 0s
Default (Java 8) / Test (module: connect)	20m 33s
Default (Java 8) / Test (module: tests)	1h 29m 23s
Default (Java 8) / Test (module: misc)	47m 23s
	10h 28m 57s

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