Allow setting buffer size limit for underlying StreamReader/StreamWriter instances

Adam Dorseyrequested to merge
asdorsey/python-qemu-qmp:x-read-buffer-limit into main

This change exposes the limit parameter of the underlying StreamReader and StreamWriter instances. This is helpful for the use case of transferring files in and out of a VM via the QEMU guest agent's guest-file-open, guest-file-read, guest-file-write, and guest-file-close methods, as it allows pushing the buffer size up to the guest agent's limit of 48MB per transfer.

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