##### 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
required: false
    default: []
    version_added: "2.7"
author: "Ansible Core Team"
requirements:
   - mysql (command line binary)
   - mysqldump (command line binary)
notes:
   - Requires the mysql and mysqldump binaries on the remote host.
   - This module is B(not idempotent) when I(state) is C(import), and will import the dump file each time if run more than once.
extends_documentation_fragment: mysql
'''
EXAMPLES = r'''
- name: Create a new database with name 'bobdata'
  mysql_db:
    name: bobdata
    state: present
# Copy database dump file to remote host and restore it to database 'my_db'
- name: Copy database dump file
  copy:
    src: dump.sql.bz2
    dest: /tmp
- name: Restore database
  mysql_db:
    name: my_db
    state: import
    target: /tmp/dump.sql.bz2
- name: Dump multiple databases
  mysql_db:
    state: dump