Improve typing of django.db.backends.mysql.base.DatabaseWrapper attributes
          #2125
        
          
      
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Anyvalue of thedjango.db.backends.mysql.base.DatabaseWrapper's arguments .django.db.backends.mysql.base.DatabaseWrapper.data_typesdjango.db.backends.mysql.base.DatabaseWrapper.operatorsdjango.db.backends.mysql.base.DatabaseWrapper.pattern_opsdjango.db.backends.mysql.base.DatabaseWrapper.isolation_levelsdjango.db.backends.mysql.base.DatabaseWrapper.SchemaEditorClassdjango.db.backends.mysql.base.DatabaseWrapper.isolation_leveldjango.db.backends.mysql.base.DatabaseWrapper.needs_rollbackRelated issues