[GSoC'24] Implementation of Deck Picker Widget .

[xenonnn4w]

Purpose / Description

Initial Implementation of Deck Picker Widget .

Approach

Created the Basic layout, initial constraints, Deck layouts .

How Has This Been Tested?

https://github.com/ankidroid/Anki-Android/assets/139516059/5e327985-50a5-493a-b471-dab35357b74d

Checklist

Please, go through these checks before submitting the PR.

• [x] You have a descriptive commit message with a short title (first line, max 50 chars).
• [x] You have commented your code, particularly in hard-to-understand areas
• [x] You have performed a self-review of your own code
• [x] UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• [ ] UI Changes: You have tested your change using the Google Accessibility Scanner