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MDEV-23630: mysqldump logically dump system table information
Add --system={all, users, plugins, udfs, servers, stats, timezones} This will dump system information from the server in a logical form like: * CREATE USER * GRANT * SET DEFAULT ROLE * CREATE ROLE * CREATE SERVER * INSTALL PLUGIN * CREATE FUNCTION "stats" is the innodb statistics tables or EITS and these are dumped as INSERT/REPLACE INTO statements without recreating the table. "timezones" is the collection of timezone tables which are important to transfer to generate identical results on restoration. Two other options have an effect on the SQL generated by --system=all. These are mutually exclusive of each other. * --replace * --insert-ignore --replace will include "OR REPLACE" into the logical form like: * CREATE OR REPLACE USER ... * DROP ROLE IF EXISTS (MySQL-8.0+) * CREATE OR REPLACE ROLE ... * UNINSTALL PLUGIN IF EXISTS (10.4+) ... (before INSTALL PLUGIN) * DROP FUNCTION IF EXISTS (MySQL-5.7+) * CREATE OR REPLACE [AGGREGATE] FUNCTION * CREATE OR REPLACE SERVER --insert-ignore uses the construct " IF NOT EXISTS" where supported in the logical syntax. 'CREATE OR REPLACE USER' includes protection against being run as the same user that is importing the mysqldump. Includes experimental support for dumping mysql-5.7/8.0 system tables and exporting logical SQL compatible with MySQL. fix - MDEV-22313 compatiblity and a few minor fixes
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