fix(core): module execution with top level await (#7672)

This commit fixes implementation of top level await in "deno_core".

Previously promise returned from module execution was ignored causing to execute
modules out-of-order.

With this commit promise returned from module execution is stored on "JsRuntime"
and event loop is polled until the promise resolves.

1 files changed, 2 insertions, 0 deletions

diff --git a/cli/tests/top_level_await_bug.js b/cli/tests/top_level_await_bug.js
new file mode 100644
index 000000000..3c6860a5b
--- /dev/null
+++ b/cli/tests/top_level_await_bug.js
@@ -0,0 +1,2 @@
+const mod = await import("./top_level_await_bug_nested.js");
+console.log(mod);