feat: Add `deno serve` subcommand (#23511)

By default, `deno serve` will assign port 8000 (like `Deno.serve`).
Users may choose a different port using `--port`.

`deno serve /tmp/file.ts`

`server.ts`:
```ts
export default {
  fetch(req) {
    return new Response("hello world!\n");
  },
};
```

1 files changed, 1 insertions, 0 deletions

diff --git a/runtime/lib.rs b/runtime/lib.rs
index f33e9b7e3..ec751f207 100644
--- a/runtime/lib.rs
+++ b/runtime/lib.rs
@@ -41,6 +41,7 @@ pub mod worker;
 
 mod worker_bootstrap;
 pub use worker_bootstrap::BootstrapOptions;
+pub use worker_bootstrap::WorkerExecutionMode;
 pub use worker_bootstrap::WorkerLogLevel;
 
 mod shared;