PG<>PG qrep binary format

[serprex]

@heavycrystal

#1733 kept things simple, using text protocol while relying on protocol level compression to avoid adding knobs

Customers using qrep with binary blob data would benefit from being able to turn on binary transmission. For compatibility reasons binary transmission should not be default behavior tho. Similarly, having some options to USE PROGRAM for zstd/lz4 compression could help, but also needs to be an option since source & destination servers need to have permissions/programs