fix: Wake event loop when dynamic import promise resolves

[nathanwhit]

Fixes a hang that could occur when a module contained a dynamic import that doesn't resolve immediately, and there was a pending op outstanding.

The original reproduction (ref https://github.com/denoland/deno/issues/24098) effectively boiled down to this:

// main.ts
Deno.serve(async function (_req: Request): Promise<Response> {
    await import("./repro.ts");
    console.log("imported module");
    return new Response("done");
});

// repro.ts
await new Promise<void>((resolve) => setTimeout(resolve, 0));
console.log("module executed");

Upon getting a request, it would hang when trying to import "repro.ts". What was happening here was that Deno.serve created an op (op_http_serve) that stayed pending indefinitely, so we assumed that we would poll again, but that didn't actually hold. Unlike non-dynamic module evaluation, we weren't waking the event loop for polling when the dynamic import evaluation promise resolved.

The fix here is to attaching callbacks to the dynamic import promise to wake the event loop when it resolves, similar to what we do for normal module evaluation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.44%. Comparing base (0c7f83e) to head (9ca4c73). Report is 22 commits behind head on main.

Files	Patch %	Lines
core/modules/map.rs	76.47%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #769 +/- ## ======================================== Coverage 81.43% 81.44% ======================================== Files 97 97 Lines 23877 23987 +110 ======================================== + Hits 19445 19536 +91 - Misses 4432 4451 +19 ```

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