Add exclude_user_id Parameter to Prevent Self-Notifications in Group Messages

Summary

This pull request adds an optional exclude_user_id parameter to the send_notification_to_group and send_group_notification functions. The main objective is to allow the exclusion of a user from receiving notifications that they themselves have triggered within a group they are part of.

Changes

Add exclude_user_id=None parameter to send_notification_to_group in utils.py.
Extend send_group_notification in __init__.py to support the new exclude_user_id parameter.

Motivation

Before this change, if a user sent a notification to a group they belong to, they would receive the notification themselves. In scenarios where a user triggers an event that results in a group notification, this behavior leads to redundant and potentially confusing notifications for the user who initiated the action. This update provides a way to prevent such situations.

Backward Compatibility

The changes introduced in this PR are backward-compatible. The new exclude_user_id parameter is optional, and omitting it will not affect the existing functionality.

safwanrahman / django-webpush