Add Haskell file type icon (#6995)

Pseudomata created 

Small change to add the Haskell logo as a file icon. Screenshot below
shows what this looks like.

![CleanShot 2024-01-29 at 11 21
30@2x](https://github.com/zed-industries/zed/assets/132238190/b484c679-965a-4e73-88dc-ebb670a0f390)

Change summary

assets/icons/file_icons/file_types.json |  4 ++++
assets/icons/file_icons/haskell.svg     | 11 +++++++++++
2 files changed, 15 insertions(+)

Detailed changes

assets/icons/file_icons/file_types.json 🔗 

@@ -45,6 +45,7 @@
         "heex": "elixir",
         "htm": "template",
         "html": "template",
+        "hs": "haskell",
         "ib": "storage",
         "ico": "image",
         "ini": "settings",
@@ -146,6 +147,9 @@
         "expanded_folder": {
             "icon": "icons/file_icons/folder_open.svg"
         },
+        "haskell": {
+            "icon": "icons/file_icons/haskell.svg"
+        },
         "image": {
             "icon": "icons/file_icons/image.svg"
         },

assets/icons/file_icons/haskell.svg 🔗 

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 32 32"
+   version="1.1"
+   id="svg977"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs981" />
+  <path
+     id="path973"