##### 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
res = 0
    for each_db in db:
        res += cursor.execute("SHOW DATABASES LIKE %s", (each_db.strip().replace("_", r"\_"),))
    return res == len(db)
def db_delete(cursor, db):
    query = "DROP DATABASE %s" % mysql_quote_identifier(''.join(db), 'database')
    cursor.execute(query)
    return True
def db_dump(module, host, user, password, db_name, target, all_databases, port, config_file, socket=None, ssl_cert=None, ssl_key=None, ssl_ca=None,
            single_transaction=None, quick=None, ignore_tables=None):
    cmd = module.get_bin_path('mysqldump', True)
    
    if config_file:
        cmd += " --defaults-extra-file=%s" % shlex_quote(config_file)
    if user is not None:
        cmd += " --user=%s" % shlex_quote(user)
    if password is not None:
        cmd += " --password=%s" % shlex_quote(password)
    if ssl_cert is not None:
        cmd += " --ssl-cert=%s" % shlex_quote(ssl_cert)
    if ssl_key is not None:
        cmd += " --ssl-key=%s" % shlex_quote(ssl_key)
    if ssl_ca is not None: