Introduce the ability to cycle between alternative inline assists (#18098)

Release Notes:

- Added a new `assistant.inline_alternatives` setting to configure
additional models that will be used to perform inline assists in
parallel.

---------

Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Roy <roy@anthropic.com>
Co-authored-by: Adam <wolffiex@anthropic.com>

assets/keymaps/default-linux.json

@@ -520,6 +520,13 @@
       "alt-enter": "editor::Newline"
     }
   },
+  {
+    "context": "PromptEditor",
+    "bindings": {
+      "ctrl-[": "assistant::CyclePreviousInlineAssist",
+      "ctrl-]": "assistant::CycleNextInlineAssist"
+    }
+  },
   {
     "context": "ProjectSearchBar && !in_replace",
     "bindings": {