refactor: Use ES modules for internal runtime code (#17648)

This PR refactors all internal js files (except core) to be written as
ES modules.
`__bootstrap`has been mostly replaced with static imports in form in
`internal:[path to file from repo root]`.
To specify if files are ESM, an `esm` method has been added to
`Extension`, similar to the `js` method.
A new ModuleLoader called `InternalModuleLoader` has been added to
enable the loading of internal specifiers, which is used in all
situations except when a snapshot is only loaded, and not a new one is
created from it.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/ext/web/benches/timers_ops.rs b/ext/web/benches/timers_ops.rs
index b28b1ae1d..a2af22982 100644
--- a/ext/web/benches/timers_ops.rs
+++ b/ext/web/benches/timers_ops.rs
@@ -28,9 +28,10 @@ fn setup() -> Vec<Extension> {
     deno_console::init(),
     deno_web::init::<Permissions>(BlobStore::default(), None),
     Extension::builder("bench_setup")
-    .js(vec![
-      ("setup", r#"
-      const { setTimeout, handleTimerMacrotask } = globalThis.__bootstrap.timers;
+    .esm(vec![
+      ("internal:setup", r#"
+      import { setTimeout, handleTimerMacrotask } from "internal:ext/web/02_timers.js";
+      globalThis.setTimeout = setTimeout;
       Deno.core.setMacrotaskCallback(handleTimerMacrotask);
       "#),
     ])