pg_dump: Reduce use of global variables

Most pg_dump.c global variables, which were passed down individually to
dumping routines, are now grouped as members of the new DumpOptions
struct, which is used as a local variable and passed down into routines
that need it.  This helps future development efforts; in particular it
is said to enable a mode in which a parallel pg_dump run can output
multiple streams, and have them restored in parallel.

Also take the opportunity to clean up the pg_dump header files somewhat,
to avoid circularity.

Author: Joachim Wieland, revised by Álvaro Herrera
Reviewed by Peter Eisentraut

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