pgsql: Change pg_test_timing to measure in nanoseconds not microseconds

Change pg_test_timing to measure in nanoseconds not microseconds.

Most of our platforms have better-than-microsecond timing resolution,
so the original definition of this program is getting less and less
useful.  Make it report nanoseconds not microseconds.  Also, add a
second output table that reports the exact observed timing durations,
up to a limit of 1024 ns; and be sure to report the largest observed
duration.

The documentation for this program included a lot of system-specific
details that now seem largely obsolete.  Move all that text to the
PG wiki, where perhaps it will be easier to maintain and update.

Also, improve the TAP test so that it actually runs a short standard
run, allowing most of the code to be exercised; its coverage before
was abysmal.

Author: Hannu Krosing <hannuk@google.com>
Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/be0339cc-1ae1-4892-9445-8e6d8995a44d@eisentraut.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/0b096e379e6f9bd49d38020d880a7da337e570ad

Modified Files
--------------
doc/src/sgml/ref/pgtesttiming.sgml      | 279 +++++++++++---------------------
src/bin/pg_test_timing/pg_test_timing.c | 172 ++++++++++++++++----
src/bin/pg_test_timing/t/001_basic.pl   |  17 ++
3 files changed, 251 insertions(+), 217 deletions(-)