Feat: add small total maintenance events count widget

[TMaszko]

What it Does

• Closes FEATURE - Small Widget, View Maintenance Events #15
• It adds small widget that displays total maintenance events count for a selected vehicle. User can configure selected vehicle by long pressing on it.

How I Tested

• Run the Widget schema
• Add a new vehicle in the main app
• Check the Home Screen -> Now widget will look like so:

• Long press the widget and select the vehicle

• Select a vehicle

• In case of no events you will see something like this:

• In case of any events:

• In case of an unexpected error:

Notes

• Cross sharing Firebase authentication here
• Kudos to aking618 for a great work that this PR is heavily inspired by.
• Designs are not final ;) I couldn't quickly find any better solution though :D
• This is my first PR in Swift so please keep that in mind ;)

Screenshot

Screenshot from the widget gallery

[mikaelacaron]

Great work!! Main thing to change is the DataService to use async throws, rather than the Result type

I've also updated various comments / line breaks here and there, so be sure to pull changes, and then make the last change that I noted! Thank you, then I'll re-review

If you have any questions, you can comment directly on that thread, otherwise click the resolve button once you've addressed my comment. Once you fix everything, please click the re-review button!

[mikaelacaron]

This looks hard coded, and instead we'd need a way to properly use the xcconfig file, using the bundle ID, PRODUCT_BUNDLE_IDENTIFIER because it should be unique for each person who's contributed to the project

If you're not sure how to fix this, drop a comment and I can do it before merging this

[TMaszko]

Since it's a pure config stuff ;) I'll leave it for you

[mikaelacaron]

same this this using the xcconfig file

[mikaelacaron]

same here about the xcconfig file

[mikaelacaron]

Great work!! 👏 thank you!!

It wasn't showing the widget when I was signed in anonymously, but I'll Sign in with Apple and see if that changes, but otherwise that's totally fine! We can always fix that later if needed