Port Postgres egg to CHICKEN 65.0.0

This has quite a few changes due to the low-level nature of this code:
when the contents of a string get copied by C functions, we can't pass
it to arguments of the scheme-pointer type directly anymore.

Instead, strings are now wrapper objects which point to an internal
(NUL-terminated!) bytevector.  So not only do we have to extract this
bytevector and pass it to these C functions, but we also need to
calculate the string length excluding the NUL terminator.  This
creates a bit more branching in the code to get the thing to copy and
length.

The nice thing is that we no longer need to append NUL bytes to
strings in a few places.  Instead, we can just pass the raw bytevector
to the C functions, which means this should be rather faster now.

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