feat: implemented pusher service for real time notifications.

[edwinedjokpa]

Pull Request

Description

This PR adds a Pusher service to handle real-time event triggering and its corresponding unit tests.

Related Issue

#1289

Fixes #(issue)

New Feature

• feat: New feature
• fix: Bug fix
• docs: Documentation updates
• style: Code style/formatting changes
• refactor: Code refactoring
• perf: Performance improvements
• test: Test additions/updates
• chore: Build process or tooling changes
• ci: CI configuration changes
• other:

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual tests

Test Evidence

Screenshots (if applicable)

Documentation Screenshots (if applicable)

Checklist

• My code follows the project's coding style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have included a screenshot showing all tests passing
• I have included documentation screenshots (if applicable)

Additional Notes

This implementation ensures proper handling of Pusher events, including logging success messages and throwing errors when necessary. The unit tests validate successful event triggering and error handling scenarios.

[incredible-phoenix246]

Reason for this PR?

[edwinedjokpa]

Reason for this PR?

New feature for real time notifications with pusher as my issue.