Add OneSignal delivery method

[Spone]

Pull Request

Summary:
Add a OneSignal delivery method

Co-Authored with @lovethebomb

Related Issue:
#473

Description:
We used the Twilio delivery method as a starting point to implement OneSignal.

Testing:
We added a tests based on Twilio delivery method tests, but I think more thorough testing would be needed.

Checklist:

• Code follows the project's coding standards
• Tests have been added or updated to cover the changes
• Documentation has been updated (if applicable)
• All existing tests pass
• Conforms to the contributing guidelines

Additional Notes:

[excid3]

I'm not familiar with OneSignal API but looks like they also support email, SMS, so should this be named more specifically for the type or is their API generic enough to support all of their notification types?

[Spone]

I'm not familiar with OneSignal API but looks like they also support email, SMS, so should this be named more specifically for the type or is their API generic enough to support all of their notification types?

I'll look into it. We're only using push in our current project. At first sight, it seems you just need to alter the target_channel param.

[excid3]

Standard is set to use Ruby 3.0 syntax but not newer (for compatibility) so looks like you're maybe using some newer features?

We could move to 3.1 since 3.0 is EOL but unless it's a really useful new feature, I don't mind keeping some older compatibility.

[Spone]

Got it! Not sure what's going on there: https://github.com/excid3/noticed/actions/runs/13077089941/job/36491828610?pr=524

[Spone]

@excid3 any clue about the CI fail?