Badges Functionality + badge overview

[bkatler]

In this PR:

• Added Badges for the following achievements: Creating 1, 5, or 10 stacks, Getting 5, 25, or 100 points, and Getting a 5, 15, or 30 day streak.
• When a user gets a badge, a pop-up comes on their screen which shows the badge and explains it
• Users can only get badges once
• To view badges, they hit the Badge Gallery Overview button on Profile (Profile is a slightly old version, will merge main back into here once the profile pr is approved)
• Badge Gallery Overview allows users to see all badges they have
• I added an animation which transitions across badges

I think it makes more sense to do profile pr first especially because it's only a few minor changes. When that happens I'll merge main in here and fix any conflicts asap :)

[laurenindira]

immediately obvious issues addressed, i need to test more on my end to comment on the logic. however, there was enough to submit an initial review

[bkatler]

Resolved all issues, full notes:

• Restored all accidentally deleted credits, comments, and TODOs
• Removed default value of earnedBadges from User Model
• Removed all logic requiring firebase and Firestore inside CardStackView and created a helper function called updateStreakAndCheckForBadge() inside AuthViewModel
• Removed extra custom button from nav on ContentView
• Some other minor changes (e.g. restored previews, weird formatting stuff)