feat: Show notification types with respect to user forum roles

[AhtishamShahid]

Check forum roles in case attribute named visible_to is set on notification preference object . This type of notification preference would be visible one to user that have role that is set in configurations.

Example

from openedx.core.djangoapps.django_comment_common.models import (
    FORUM_ROLE_ADMINISTRATOR,
    FORUM_ROLE_COMMUNITY_TA,
    FORUM_ROLE_GROUP_MODERATOR,
    FORUM_ROLE_MODERATOR,
)
COURSE_NOTIFICATION_TYPES = {
...
    'new_question_post': {
        'notification_app': 'discussion',
        'name': 'new_question_post',
        'is_core': False,
        'info': '',
        'web': False,
        'email': False,
        'push': False,
        'non_editable': [],
        'content_template': _('<{p}><{strong}>{username}</{strong}> asked <{strong}>{post_title}</{strong}></{p}>'),
        'content_context': {
            'post_title': 'Post title',
            'username': 'Post author name',
        },
        'email_template': '',
        'filters': [FILTER_AUDIT_EXPIRED_USERS_WITH_NO_ROLE],
        'visible_to': [FORUM_ROLE_MODERATOR, FORUM_ROLE_COMMUNITY_TA, FORUM_ROLE_ADMINISTRATOR]

    }
...
}

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.