<!--- 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
```
super(CryptHandler, self).__init__(module)
        self._cryptsetup_bin = self._module.get_bin_path('cryptsetup', True)
    def get_container_name_by_device(self, device):
        ''' obtain LUKS container name based on the device where it is located
            return None if not found
            raise ValueError if lsblk command fails
        '''
        result = self._run_command([self._lsblk_bin, device, '-nlo', 'type,name'])
        if result[RETURN_CODE] != 0:
            raise ValueError('Error while obtaining LUKS name for %s: %s'
                             % (device, result[STDERR]))
        m = LUKS_NAME_REGEX.search(result[STDOUT])
        try:
            name = m.group(1)
        except AttributeError:
            name = None
        return name
    def get_container_device_by_name(self, name):
        ''' obtain device name based on the LUKS container name
            return None if not found
            raise ValueError if lsblk command fails
        '''
        
        result = self._run_command([self._cryptsetup_bin, 'status', name])
        if result[RETURN_CODE] != 0:
            return None
        m = LUKS_DEVICE_REGEX.search(result[STDOUT])
        device = m.group(1)
        return device
    def is_luks(self, device):