fix(node): implement libuv APIs needed to support `npm:sqlite3` (#25893)

Fixes #24740.

Implements the `uv_mutex_*` and `uv_async_*` APIs.

The mutex API is implemented exactly as libuv, a thin wrapper over the
OS's native mutex.

The async API is implemented in terms of napi_async_work. As documented
in the napi docs, you really shouldn't call `napi_queue_async_work`
multiple times (it is documented as undefined behavior). However, our
implementation doesn't have any issue with this, so I believe it suits
our purpose here.

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/napi/uv_test.js b/tests/napi/uv_test.js
new file mode 100644
index 000000000..6d8ee2671
--- /dev/null
+++ b/tests/napi/uv_test.js
@@ -0,0 +1,18 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+import { assertEquals, loadTestLibrary } from "./common.js";
+
+const uv = loadTestLibrary();
+
+Deno.test("napi uv async", async () => {
+  let called = false;
+  await new Promise((resolve) => {
+    uv.test_uv_async((value) => {
+      called = true;
+      if (value === 5) {
+        resolve();
+      }
+    });
+  });
+  assertEquals(called, true);
+});