Fix fragmented TCP packet handling #487
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This fixes an issue with handling of fragmented TCP packets.
The problem was uncovered in #474. The type inference query result for such a big enum sometimes doesn't fit into a single TCP packet so it gets split into two, with the boundary cutting a PGSQL protocol frame in half.
Solution is to concat TCP packets into a single Buffer as we receive them to make them continuous for the parsing routines. Memory is cleaned up by unreferencing the Buffer on PGSQL frame boundaries.