feat(lint): add nursery rule noMisleadingReturnType (#9799)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: minseong0324

.changeset/dark-new-old.md

@@ -0,0 +1,13 @@
+---
+"@biomejs/biome": "patch"
+---
+
+Added the rule [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/). The rule detects when a function's return type annotation is wider than what the implementation actually returns.
+
+```ts
+// Flagged: `: string` is wider than `"loading" | "idle"`
+function getStatus(b: boolean): string {
+  if (b) return "loading";
+  return "idle";
+}
+```