<!--- Verify first that your feature was not already discussed on GitHub -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
Ansible by default only creates LUKS1 format devices. Considering LUKS2 extra features and age, I think it would be beneficial to allow users to create LUKS2 devices.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
luks_device

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
For reliability, one should use either disk UUID's or labels. UUID's are (in my opinion) a hassle when it comes to using them in Ansible.

Enter labels. Labels can be the same across multiple hosts, and will be tied to the right disk/partition, even if sda1 suddenly becomes sdb1 after some hardware reconfiguration.

Now, the LUKS1 format, which Ansible creates by default with the `luks_device` module, does not support labels... Support was added with LUKS2.

It should be noted that, from what I can see, the module *does already support removing keys from LUKS2 format devices*.

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: create LUKS2 container
  luks_device:
    device: "/dev/loop0"
    state: "present"
    keyfile: "/vault/keyfile"
    format: luks2
```
module.params['keyfile'],
                                      module.params['keysize'])
            except ValueError as e:
                module.fail_json(msg="luks_device error: %s" % e)
        result['changed'] = True
        if module.check_mode:
            module.exit_json(**result)
    
    name = conditions.opened_luks_name()
    if name is not None:
        result['name'] = name
    if conditions.luks_open():
        name = module.params['name']
        if name is None:
            try:
                name = crypt.generate_luks_name(conditions.device)
            except ValueError as e:
                module.fail_json(msg="luks_device error: %s" % e)
        if not module.check_mode:
            try:
                crypt.run_luks_open(conditions.device,
                                    module.params['keyfile'],
                                    name)
            except ValueError as e:
                module.fail_json(msg="luks_device error: %s" % e)
        result['name'] = name
        result['changed'] = True
        if module.check_mode:
            module.exit_json(**result)