Mysql/MariaDB: implement edit VIEW with GUI or SQL

Mysql/MariaDB: implement edit VIEW with GUI or SQL

Delete View works (and the list is updated)
Modifying View works

But, there are at least 2 things to fix:
- adding a view still works but the list isn't updated without manual refresh)
- renaming view doesn't work (a popup error message appear)

Change-Id: I48ffb322910ca64d51a161424f265de387bdd7ad
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128483
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>