##### 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
module = AnsibleModule(
        argument_spec=dict(
            login_user=dict(type='str'),
            login_password=dict(type='str', no_log=True),
            login_host=dict(type='str', default='localhost'),
            login_port=dict(type='int', default=3306),
            login_unix_socket=dict(type='str'),
            name=dict(type='list', required=True, aliases=['db']),
            encoding=dict(type='str', default=''),
            collation=dict(type='str', default=''),
            target=dict(type='path'),
            state=dict(type='str', default='present', choices=['absent', 'dump', 'import', 'present']),
            client_cert=dict(type='path', aliases=['ssl_cert']),
            client_key=dict(type='path', aliases=['ssl_key']),
            ca_cert=dict(type='path', aliases=['ssl_ca']),
            connect_timeout=dict(type='int', default=30),
            config_file=dict(type='path', default='~/.my.cnf'),
            single_transaction=dict(type='bool', default=False),
            quick=dict(type='bool', default=True),
            ignore_tables=dict(type='list', default=[]),
        ),
        supports_check_mode=True,
    )
    if mysql_driver is None:
        module.fail_json(msg=mysql_driver_fail_msg)
    db = module.params["name"]
    if not db: