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MDEV-16026: Forbid global system_versioning_asof in non-default time zone * store `system_versioning_asof` in unix time; * both session and global vars are processed in session timezone; * setting `default` does not copy global variable anymore. Instead, it sets system_time to SYSTEM_TIME_UNSPECIFIED, which means that no 'AS OF' time is applied and `now()` can be assumed As a regression, we cannot assign values below 1970 (UTC) anymore MDEV-16481: set global system_versioning_asof=sf() crashes in specific case * sys_vars.h: add `MYSQL_TIME` field to `set_var::save_result` * sys_vars.ic: get rid of calling `var->value->get_date()` from `Sys_var_vers_asof::update()` * versioning.sysvars: add test; remove double warning refactor Sys_var_vers_asof * inherit from sys_var rather than Sys_var_enum * remove junk "DEFAULT" keyword. There is DEFAULT in SQL grammar for it. * make all conversions in check() to avoid possible errors * avoid double var->value evaluation, which could consequence in undefined behavior