The StreamCallPayload is used when making calls from the server
to the client to read from the original input stream.
It will contain the method name being called from the server side (i.e. available(), read(), etc.)
along with any parameters for the respective method.
Constructor which requires the name of the method to call on the
the original stream.
Gets the method to call on the original stream.
Sets the params for the method to call on the
stream. For example, the Integer for markSupported(int supported).
Gets the params for the method to call on the stream.