Expose internal fn to load ops for a toplevel

[StachuDotNet]

The results are currently aren't ideal, but it's better than nothing.

needs tests

[StachuDotNet]

Hm, Actually I don't think I can cover this in a unit test with the existing infra. (at least, not in a .test file) since we don't have fns to create/manipulate handlers/etc. WDYT, @pbiggar?

We could add an integration test around this, or some other more manual F# test

[pbiggar]

Is it possible to add a unit test that just checks the signature or something simple? A lot of darkinternal tests have something trivial like that, because there are hard to test. Either way, I don't think it's important to get a solid test here

[StachuDotNet]

currently a minor build error, which I'll fix in a bit. Short of that, seems good to me.