Move `WIN32OLE_` prefixed classes under `WIN32OLE` #68

Job	Run time
ruby-versions / Generate Ruby versions	1s
build (2.6)	4m 14s
build (2.7)	2m 10s
build (3.0)	3m 10s
build (3.1)	2m 28s
build (3.2)	2m 47s
build (3.3)	3m 35s
build (head)	1m 55s
build (mingw)	1m 56s
build (mswin)	1m 42s
	23m 58s

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