Add approximated Zipfian-distributed random generator to pgbench.

Generator helps to make close to real-world tests.

Author: Alik Khilazhev
Reviewed-By: Fabien COELHO
Discussion: 
https://www.postgresql.org/message-id/flat/bf3b6f54-68c3-417a-bfab-fb4d66f2b...@postgrespro.ru

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/1fcd0adeb38d6ef36066134bb3b44acc5a249a98

Modified Files
--------------
doc/src/sgml/ref/pgbench.sgml                |  29 ++++
src/bin/pgbench/exprparse.y                  |   3 +
src/bin/pgbench/pgbench.c                    | 193 ++++++++++++++++++++++++++-
src/bin/pgbench/pgbench.h                    |   3 +-
src/bin/pgbench/t/001_pgbench_with_server.pl |  38 +++++-
5 files changed, 263 insertions(+), 3 deletions(-)

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