feat(keymap-upgrader): Highlight changes

Updated the keymap upgrader to highlight which lines it changed as well
as indicate when nothing needed to be upgraded.

Also adjusted the line highlight colors to be more readable in both
light and dark color schemes.

docs/src/keymap-upgrade/keycodes.ts

@@ -101,7 +101,7 @@ export function upgradeKeycodes(tree: Tree) {
 
 function keycodeReplaceHandler(node: SyntaxNode, replacement: string | null) {
   if (replacement) {
-    return [new TextEdit(node, replacement)];
+    return [TextEdit.fromNode(node, replacement)];
   }
 
   const nodes = findBehaviorNodes(node);
@@ -110,7 +110,7 @@ function keycodeReplaceHandler(node: SyntaxNode, replacement: string | null) {
     console.warn(
       `Found deprecated code "${node.text}" but it is not a parameter to a behavior`
     );
-    return [new TextEdit(node, `/* "${node.text}" no longer exists */`)];
+    return [TextEdit.fromNode(node, `/* "${node.text}" no longer exists */`)];
   }
 
   const oldText = nodes.map((n) => n.text).join(" ");