Top-level awaits #7

Problem: Mocha custom reporter still does not support ES Modules.
As long as we use mocha, we cannot have top-level awaits, such as the one in module.ts.

Workarounds like calling an async function do not work either, in that case the tests do not get loaded.

Why we want this fixed: However, awaits when building tests is extremely useful. We often want to compile stuff at this point.