Add a way to configure default search options (#17179)

Closes https://github.com/zed-industries/zed/issues/4646

```json
// Search options to enable by default when opening new project and buffer searches.
"search": {
  "whole_word": false,
  "case_sensitive": false,
  "include_ignored": false,
  "regex": false
}
```

Release Notes:

- Added `search` settings section to configure default options enabled
in buffer and project searches
([#4646](https://github.com/zed-industries/zed/issues/4646))

---------

Co-authored-by: Kirill Bulatov <mail4score@gmail.com>

crates/vim/src/test/vim_test_context.rs

@@ -16,12 +16,12 @@ impl VimTestContext {
             return;
         }
         cx.update(|cx| {
-            search::init(cx);
             let settings = SettingsStore::test(cx);
             cx.set_global(settings);
             release_channel::init(SemanticVersion::default(), cx);
             command_palette::init(cx);
             crate::init(cx);
+            search::init(cx);
         });
     }