##### 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
name: db_1,db_2
    target: /tmp/dump.sql
- name: Dump multiple databases
  mysql_db:
    state: dump
    name:
      - db_1
      - db_2
    target: /tmp/dump.sql
- name: Dump all databases to hostname.sql
  mysql_db:
    state: dump
    name: all
    target: /tmp/dump.sql
- name: Import file.sql similar to mysql -u <username> -p <password> < hostname.sql
  mysql_db:
    state: import
    name: all
    target: /tmp/dump.sql
'''
import os
import subprocess
import traceback
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.database import mysql_quote_identifier
from ansible.module_utils.mysql import mysql_connect, mysql_driver, mysql_driver_fail_msg
from ansible.module_utils.six.moves import shlex_quote
from ansible.module_utils._text import to_native
#
def db_exists(cursor, db):