BufferInputStream should support mark/reset

[idelpivnitskiy]

BufferInputStream does not implement mark/reset methods of the InputStream, while we can. We should implement it to make it close to ByteArrayInputStream and ByteBufInputStream (from netty) behavior.

[SivaTharun]

@idelpivnitskiy can i work on this issue, i see that the class src/main/java/io/servicetalk/buffer/api/BufferInputStream.java, has to implement mar and reset methods. can you also add the expectation of the method implementation, what should it essentially do.

[idelpivnitskiy]

Thank you for the interest @SivaTharun! Absolutely, you can take it.

The goal is to implement the standard behavior of mark/reset methods defined by Java community in InputStream javadoc. You can refer to java.io.ByteArrayInputStream and io.netty.buffer.ByteBufInputStream to get the basic idea of the implementation. Please, also add tests to verify new behavior.