iproto: implement stream id in binary iproto protocol

For further implementation of streams, we need to separate
requests belonging to and not belonging to streams. For this
purpose, the stream ID field was added to the iproto binary
protocol. For requests that do not belong to stream, this field
is omitted or equal to zero. For requests belonging to stream,
we use this field to determine which stream the request belongs to.

Part of #5860

@TarantoolBot document
Title: new field in binary iproto protocol

Add new field to binary iproto protocol.
`IPROTO_STREAM_ID 0x0a` determines whether a request
belongs to a stream or not. If this field is omited
or equal to zero this request doesn't belongs to stream.