feat(service): Add Pushover service

[joshm91]

Description

Implement Pushover service to fix #456

Motivation and Context

• This PR is to solve feat(service): Add Pushover service #456

How Has This Been Tested?

• Unit tests

* End to end test

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[svaloumas]

Hello @joshm91 !

Thank you very much for your efforts and contribution! That's a beautifully made PR 🚀
Could you please add a doc.go file, like this for example, just for completeness? I think we're good to go once you take care of it.

[joshm91]

@svaloumas doc.go has been added! 🎉

[codecov-commenter]

Codecov Report

Base: 72.48% // Head: 73.04% // Increases project coverage by +0.55% 🎉

Coverage data is based on head (0cbd639) compared to base (db14718).
Patch coverage: 84.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #467      +/-   ##
==========================================
+ Coverage   72.48%   73.04%   +0.55%     
==========================================
  Files          32       34       +2     
  Lines         985     1035      +50     
==========================================
+ Hits          714      756      +42     
- Misses        203      207       +4     
- Partials       68       72       +4     

Impacted Files	Coverage Δ
service/pushover/mock_pushover_client.go	73.91% <73.91%> (ø)
service/pushover/pushover.go	92.59% <92.59%> (ø)

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[svaloumas]

We appreciate your time and efforts @joshm91 ! We'd certainly love to see more contributions from you! 👍