Allow DBMigrationHook to migrate sqlite databases

[moreamazingnick]

Is your feature request related to a problem? Please describe.

I use sqlite3 dababases to start developing and later in a more mature state move to mysql.
I recently got familiar with the DbMigrationHook an realized that it wants to use the mysql-upgrades folder for upgrades on sqlite databases with is not correct.

Describe the solution you'd like

A clear and concise description of what you want to happen.

        if ($this->getDb()->getAdapter() instanceof Pgsql) {
            $upgradeDir = static::PGSQL_UPGRADE_DIR;
        }elseif($this->getDb()->getAdapter() instanceof Sqlite){
            $upgradeDir = static::SQLITE_UPGRADE_DIR;
        }else{
            $upgradeDir = static::MYSQL_UPGRADE_DIR;
        }

Also

• MigrationManager->checkRequiredPrivileges()
• DbMigrationHook->tableExists()
• DbMigrationHook->getColumnType()

need to be adapted.

Describe alternatives you've considered

Override the load() function but that would lead to code duplication

Additional context

I'm happy to provide a merge request.

Best Regards and thanks in advance

Nicolas