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.

assets/icons/file_icons/font.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="14px" height="14px" viewBox="0 0 14 14" version="1.1">
+<g id="surface1">
+<path style="fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(0%,0%,0%);stroke-opacity:1;stroke-miterlimit:4;" d="M 16.001786 21 L 19.497321 21 M 5.997321 21 L 12 3 L 18.002679 21 M 4.502679 21 L 7.998214 21 M 14.997321 14.000893 L 9.002679 14.000893 " transform="matrix(0.486111,0,0,0.486111,1.166667,1.166667)"/>
+</g>
+</svg>