<!--- 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 -->
Atm, there is no way to put the server in rescue mode

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
hcloud_server

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Atm, Since I can use the hetzner api, I'm using the following code to put it into rescue:
<!--- Paste example playbooks or commands between quotes below -->
```yaml
    - name: Enable rescue
      uri:
        url: "https://api.hetzner.cloud/v1/servers/{{ item }}/actions/enable_rescue"
        method: POST
        status_code: 201
        body_format: json
        body:
          type: "linux64"
          ssh_keys: [341997]
        headers:
          Content-Type: "application/json"
          Authorization: "Bearer {{ hostvars['localhost']['hetzner_api_token'] }}"
      with_items:
        - "{{ server_id }}"
```

<!--- HINT: You can also paste gist.github.com links for larger files -->

if self.hcloud_server.status != Server.STATUS_OFF:
            if not self.module.check_mode:
                self.client.servers.power_off(self.hcloud_server).wait_until_finished()
            self._mark_as_changed()
        self._get_server()
    def rebuild_server(self):
        self.module.fail_on_missing_params(
            required_params=["image"]
        )
        if not self.module.check_mode:
            self.client.servers.rebuild(self.hcloud_server, self.client.images.get_by_name(self.module.params.get("image"))).wait_until_finished()
        self._mark_as_changed()
        self._get_server()
    def present_server(self):
        self._get_server()
        if self.hcloud_server is None:
            self._create_server()
        else:
            self._update_server()
    def delete_server(self):
        self._get_server()
        if self.hcloud_server is not None:
            if not self.module.check_mode:
                self.client.servers.delete(self.hcloud_server).wait_until_finished()
            self._mark_as_changed()
        self.hcloud_server = None
    @staticmethod
    def define_module():