Add file icons for Dart, Swift, Kotlin, Java, Fonts (#8404)

Added icons for
- Dart - https://www.svgrepo.com/svg/473578/dart
- Swift - https://www.svgrepo.com/svg/512939/swift-146
- Kotlin - https://www.svgrepo.com/svg/473692/kotlin
- Java - https://www.svgrepo.com/svg/449119/java-filled
- Fonts - https://www.svgrepo.com/svg/532172/font

Extended support for
- .plist as template

<img width="164" alt="Screenshot 2024-02-26 at 12 17 08 AM"
src="https://github.com/zed-industries/zed/assets/25414681/bd438028-af82-44cd-934f-21ab72ac9d0f">

Release Notes:

- Added icons for Dart, Swift, Kotlin, Java, and font files.
- Changed icon for `.plist` files.