bigger output buffer, I/O zone

[pmp-p]

https://github.com/postgres/postgres/blob/86a2d2a321215797abd1c67d9f2c52510423a97a/src/backend/libpq/pqcomm.c#L118

PqSendBuffer could use raw memory before program memory directly
this does not require malloc and allow for direct use of Dataview on https://developer.mozilla.org/en-US/docs/WebAssembly/JavaScript_interface/Memory