feat(search): allow custom search icon

Allows consumers to render a different Carbon icon instead of the default Search16 icon.

docs/src/COMPONENT_API.json

@@ -7939,6 +7939,15 @@
           "constant": false,
           "reactive": false
         },
+        {
+          "name": "icon",
+          "kind": "let",
+          "description": "Specify the icon from `carbon-icons-svelte` to render",
+          "type": "typeof import(\"carbon-icons-svelte\").CarbonIcon",
+          "isFunction": false,
+          "constant": false,
+          "reactive": false
+        },
         {
           "name": "id",
           "kind": "let",

docs/src/pages/components/Search.svx

@@ -1,4 +1,5 @@
 <script>
+  import Query16 from "carbon-icons-svelte/lib/Query16";
   import { Search } from "carbon-components-svelte";
   import Preview from "../../components/Preview.svelte";
 </script>
@@ -43,6 +44,10 @@ The "clear" event is dispatched when clicking the "X" button in the search input
 
 <Search disabled />
 
+### Custom search icon
+
+<Search icon={Query16} />
+
 ### Skeleton
 
 <Search skeleton />