[Feature] implements adminer that is much more stable and provide both mysql/postgres ui

[mckaygerhard]

mplements adminer for database manager ui

currently with phpmyadmin and phppgadmin myvesta must mantain two different integrations, that introduced much more bug due complex "modern" tendency..

adminer is much more "simplified and simplistic" so bugs are much less (far away) rather than those two!

this was already requested as hestiacp/hestiacp#561 and a first rudimentary PR was made long time ago in Vesta. #1847
ther is a feat request at hestia hestiacp/hestiacp#3713

a PR was provide long time ago but seem in such time developers dont have "common sense".. now time passed and history facts demostrated superiority of adminer in security, code quality and performance

PROS AND CONS

key	Adminer	phpMyAdmin	phppgadmin
Login support	Its complete, offers permanent login including user list	phpMyAdmin only partial support through configuration.	phppgadmin relies on user privilegies, do not manage the pg_user
Supported DBMS	MySQL/MariaDB/PostgresQL/etc	Mysql only	Postgresql
Code quality	good	too big	too big
Popularity	stable slow growning cos are not used by windosers	its shipped inside xamp so its only popular due that	its not so popular and ui is ugly
UI tweaking	can be tweaked by just another php file as plugin	cannot be tweaked without customizing new php files, already provided	cannot be tweaked
Multiple editing	Adminer features a special button that is displayed before this operation But its more limited	phpMyAdmin allows you to use the clone row feature after altering. Hence it is possible to duplicate the row by mistake when auto keys are presents	phppgadmin allow in line editing but it overloaded the ui
Schema	Adminer uses HTML and JavaScript but in a string efficient way.	Schema in phpMyAdmin is available after setting up and specifying extra tables in the configuration file and only through PDF or canvas.	phppgadmin can access the two level of schema (as postgresql looks like oracles)
Database list	Adminer downloads this data asynchronously. filtering is made by user access	Database list is slow because it displays the number of tables and filtering rely in user access	Database list is slow due the lot of features of postgresql but filtering is limited to user access, do not manage pg_Access
Customization	Adminer offers advanced customization through a PHP extension class. just easy cos can made by separate files	phpMyAdmin offers very simple customizations through special tables. but ui files are joining in php code	phppgadmin ui is not fully customizable for
Size	The latest full-featured version of Adminer (v4.7.8) comes in at a measly 478 KB, Adminer’s MySQL-only version (354 KB)	phpMyAdmin’s latest version (v5.0.4) is 13.7 MB	phppgadmin download size is aroung 10 to 20 megs