Add DataInputStream::skipBytes #644

Job	Run time
rust_ci (macos-latest, stable)	2m 21s
rust_ci (macos-latest, beta)	1m 32s
rust_ci (windows-latest, beta)	4m 1s
rust_ci (ubuntu-latest, beta)	1m 28s
rust_ci (windows-latest, stable)	3m 35s
rust_ci (ubuntu-latest, stable)	1m 26s
	14m 23s

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