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, 3 insertions, 0 deletions

diff --git a/bench_util/js_runtime.rs b/bench_util/js_runtime.rs
index 7868c433a..103b97430 100644
--- a/bench_util/js_runtime.rs
+++ b/bench_util/js_runtime.rs
@@ -10,6 +10,9 @@ use crate::profiling::is_profiling;
 pub fn create_js_runtime(setup: impl FnOnce() -> Vec<Extension>) -> JsRuntime {
   JsRuntime::new(RuntimeOptions {
     extensions_with_js: setup(),
+    module_loader: Some(std::rc::Rc::new(
+      deno_core::InternalModuleLoader::new(None),
+    )),
     ..Default::default()
   })
 }