##### 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
elif os.path.splitext(target)[-1] == '.xz':
        comp_prog_path = module.get_bin_path('xz', required=True)
    if comp_prog_path:
        p1 = subprocess.Popen([comp_prog_path, '-dc', target], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        p2 = subprocess.Popen(cmd, stdin=p1.stdout, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (stdout2, stderr2) = p2.communicate()
        p1.stdout.close()
        p1.wait()
        if p1.returncode != 0:
            stderr1 = p1.stderr.read()
            return p1.returncode, '', stderr1
        else:
            return p2.returncode, stdout2, stderr2
    else:
        cmd = ' '.join(cmd)
        cmd += " < %s" % shlex_quote(target)
        rc, stdout, stderr = module.run_command(cmd, use_unsafe_shell=True)
        return rc, stdout, stderr
def db_create(cursor, db, encoding, collation):
    query_params = dict(enc=encoding, collate=collation)
    query = ['CREATE DATABASE %s' % mysql_quote_identifier(''.join(db), 'database')]
    if encoding:
        query.append("CHARACTER SET %(enc)s")
    if collation:
        query.append("COLLATE %(collate)s")
    query = ' '.join(query)
    cursor.execute(query, query_params)
    return True
#
def main():