expose JS_GetModuleNamespace (or rebase on upstream)

[justjake]

Upstream decided to expose JS_GetModuleNamespace as an API to get the exports of a ESModule, see here:

https://github.com/bellard/quickjs/blob/2c793e50979e64a51178c1048071c97722eb1bf1/quickjs.h#L879

My library supports both upstream and quickjs-ng, so currently I need to patch in JS_GetModuleNamespace in my vendored copy of quickjs-ng

[saghul]

We added an equivalente before 😔 6868fb9

[justjake]

I know you added some custom C APIs for this purpose, but it would be great to pick up the official API from upstream

[saghul]

Yep, will do.

[justjake]

Thanks