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##### SUMMARY
Add comment_start_string and comment_end_string to template plugin.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
template

##### ADDITIONAL INFORMATION
In some situation, we need to change comment behavior of template plugin, for an example macros in Zabbix is like {#MACRO}.

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: Render a template with "comment_start_string" set to [#
  template:
    src: template.xml.j2
    dest: template.xml
    comment_start_string: "[#"
    comment_end_string: "#]"
```

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

- Returns a list of strings; for each template in the list of templates you pass in, returns a string containing the results of processing that template.
    options:
      _terms:
        description: list of files to template
      convert_data:
        type: bool
        description:
            - Whether to convert YAML into data. If False, strings that are YAML will be left untouched.
            - Mutually exclusive with the jinja2_native option.
      variable_start_string:
        description: The string marking the beginning of a print statement.
        default: '{{'
        version_added: '2.8'
        type: str
      variable_end_string:
        description: The string marking the end of a print statement.
        default: '}}'
        version_added: '2.8'
        type: str
      jinja2_native:
        description:
            - Controls whether to use Jinja2 native types.
            - It is off by default even if global jinja2_native is True.
            - Has no effect if global jinja2_native is False.
            - This offers more flexibility than the template module which does not use Jinja2 native types at all.
            - Mutually exclusive with the convert_data option.
        default: False
        version_added: '2.11'
        type: bool
      template_vars: