feat: Allow selecting web app id

[JCQuintas]

Description

Add the option web-app-id to allow users to select which of the web apps they want to use. Didn't use display-name as that can easily be changed from Firebase's side, which could cause issues.

Possible improvements

• Ask user to select when not in CI
• The behaviour used in this option can later be extrapolated to be used for linux and windows apps as well.

resolves #77

Type of Change

• [x] ✨ feat -- New feature (non-breaking change which adds functionality)
• [ ] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [ ] 🗑️ chore -- Chore

[CLAassistant]

All committers have signed the CLA.

[JCQuintas]

Do you have an expected time for this to be reviewed? Would be really helpful on my current project. If it is not merged soon I'll be using my own fork instead ☹️

[Lyokone]

I'm going to have a look