Add implementations for onShare and onSearchWeb (#2143)

Fixes #2088

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] All existing and new tests are passing.

---------

Co-authored-by: Brett Morgan <brett.morgan@gmail.com>

simplistic_editor/lib/basic_text_field.dart

@@ -28,6 +28,8 @@ class BasicTextField extends StatefulWidget {
     VoidCallback? onSelectAll,
     VoidCallback? onLookUp,
     VoidCallback? onLiveTextInput,
+    VoidCallback? onSearchWeb,
+    VoidCallback? onShare,
     TextSelectionToolbarAnchors anchors,
   ) {
     return AdaptiveTextSelectionToolbar.editable(
@@ -38,10 +40,9 @@ class BasicTextField extends StatefulWidget {
       onSelectAll: onSelectAll,
       onLookUp: onLookUp,
       onLiveTextInput: onLiveTextInput,
+      onSearchWeb: onSearchWeb,
+      onShare: onShare,
       anchors: anchors,
-      // TODO(Renzo-Olivares): https://github.com/flutter/samples/issues/2088
-      onSearchWeb: null,
-      onShare: null,
     );
   }