Add initial specs for IO::Buffer #2131

Job	Run time
RuboCop	54s
specs (macos, 3.2.9)	1m 30s
specs (ubuntu, 3.2.9)	1m 26s
specs (ubuntu, 3.3.9)	1m 28s
specs (macos, 3.3.9)	1m 25s
specs (windows, 3.3.9)	3m 15s
specs (windows, 3.4.7)	3m 35s
specs (ubuntu, 3.4.7, --enable-frozen-string-literal)	1m 37s
specs (macos, 3.4.7)	1m 57s
specs (ubuntu, 3.4.7, --parser=parse.y)	1m 40s
specs (windows, 3.2.8)	3m 32s
specs (ubuntu, 3.4.7)	1m 33s
	23m 52s

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