<!--- 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 -->
In gitlab_hook module doesn't have parameter "Comment" which is necessary for my DevOps flow and generally very useful for triggering a job. Without this option, I and a lot of people cannot use this module fully. 

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
https://docs.ansible.com/ansible/latest/modules/gitlab_hook_module.html

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
1. I use the newest version of ansible.
2. It's about this option in gitlab:
[![comments.png](https://i.postimg.cc/C5tkJdJ7/comments.png)](https://postimg.cc/sGYMgjkG)
<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

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

sample: "Success"
result:
  description: json parsed response from the server
  returned: always
  type: dict
error:
  description: the error message returned by the GitLab API
  returned: failed
  type: str
  sample: "400: path is already in use"
hook:
  description: API object
  returned: always
  type: dict
'''
import os
import re
import traceback
GITLAB_IMP_ERR = None
try:
    import gitlab
    HAS_GITLAB_PACKAGE = True
except Exception:
    GITLAB_IMP_ERR = traceback.format_exc()
    HAS_GITLAB_PACKAGE = False
from ansible.module_utils.api import basic_auth_argument_spec
from ansible.module_utils.basic import AnsibleModule, missing_required_lib
from ansible.module_utils._text import to_native
from ansible.module_utils.gitlab import findProject
class GitLabHook(object):