Issue #2550291 by neclimdul, phenaproxima: Improve and generalize database dump tools

core/lib/Drupal/Core/Command/DbCommandBase.php

core/lib/Drupal/Core/Command/DbDumpApplication.php

core/lib/Drupal/Core/Command/DbDumpCommand.php

core/lib/Drupal/Core/Command/DbImportCommand.php

core/lib/Drupal/Core/Command/DbToolsApplication.php

core/modules/system/src/Tests/Update/DbDumpTest.php

...les/system/tests/src/Kernel/Scripts/DbCommandBaseTest.php

...les/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php

...s/system/tests/src/Kernel/Scripts/DbImportCommandTest.php

...ystem/tests/src/Kernel/Scripts/DbToolsApplicationTest.php

core/scripts/db-tools.php

core/scripts/dump-database-d8-mysql.php