backend libpq void * argument for binary data

SnapBuildRestoreContents() void * argument for binary data

jsonb internal API void * argument for binary data

backend launchers void * arguments for binary data

Remove various unnecessary (char *) casts

Make amcanorder independent of amconsistentordering

Fix typo

Improve possible performance regression

Rename amcancrosscompare

Set amcancrosscompare to true for hash