Add initial specs for IO::Buffer #2134

Job	Run time
RuboCop	58s
specs (macos, 3.3.9)	1m 39s
specs (windows, 3.4.7)	3m 23s
specs (ubuntu, 3.4.7)	1m 38s
specs (windows, 3.3.9)	3m 18s
specs (ubuntu, 3.4.7, --parser=parse.y)	1m 36s
specs (ubuntu, 3.3.9)	1m 24s
specs (windows, 3.2.8)	3m 37s
specs (ubuntu, 3.4.7, --enable-frozen-string-literal)	1m 37s
specs (macos, 3.2.9)	1m 14s
specs (ubuntu, 3.2.9)	1m 30s
specs (macos, 3.4.7)	1m 25s
	23m 19s

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