##### SUMMARY
mysql_db module should be able to create/drop multiple databases

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
lib/ansible/modules/database/mysql/mysql_db.py

##### ADDITIONAL INFORMATION
Why and what it would solve:
Avoids repetitive tasks to create/delete more than one databases (similar to https://github.com/ansible/ansible/issues/56059)

<!--- Paste example playbooks or commands between quotes below -->

- Create (Multiple databases)
```yaml
  tasks:
  - name: Create multiple databases (provided in comma separated form)
    mysql_db:
      name: bobdata, bobthebuilder
      state: present
  - name: Create multiple databases (provided in list form)
    mysql_db:
      name:
        - bobdata
        - bobthebuilder
      state: present
```

- Delete/Drop (Multiple databases)
```yaml
  - name: Delete/drop multiple databases (provided in comma separated form)
    mysql_db:
      name: bobdata, bobthebuilder
      state: absent
  - name: Delete/drop multiple databases (provided in list form)
    mysql_db:
      name:
        - bobdata
        - bobthebuilder
      state: absent
```

Credits for the idea to @Andersson007 from comment https://github.com/ansible/ansible/pull/56721#issuecomment-505128646
except Exception as e:
                    module.fail_json(msg="error creating database: %s" % to_native(e),
                                     exception=traceback.format_exc())
            module.exit_json(changed=changed, db=db_name)
        elif state == "import":
            if module.check_mode:
                module.exit_json(changed=True, db=db_name)
            else:
                try:
                    changed = db_create(cursor, db, encoding, collation)
                    if changed:
                        rc, stdout, stderr = db_import(module, login_host, login_user,
                                                       login_password, db, target, all_databases,
                                                       login_port, config_file, socket, ssl_cert, ssl_key, ssl_ca)
                        if rc != 0:
                            module.fail_json(msg="%s" % stderr)
                        else:
                            module.exit_json(changed=True, db=db_name, msg=stdout)
                except Exception as e:
                    module.fail_json(msg="error creating database: %s" % to_native(e),
                                     exception=traceback.format_exc())
        elif state == "absent":
            module.exit_json(changed=False, db=db_name)
        elif state == "dump":
            if module.check_mode:
                module.exit_json(changed=False, db=db_name)
            module.fail_json(msg="Cannot dump database %r - not found" % (db_name))
if __name__ == '__main__':
    main()