add `awaitAsync` API reference

[EltonLobo07]

Since awaitAsync did not have an equivalent sync action (which is obvious but mentioned for context), I had to fill in the "related" schemas, methods, and utils. So I might have made a mistake, especially relating some methods to awaitAsync. I'll share my thoughts:

• For schemas, it is straightforward, as I can use any schema after awaiting the promise schema. That means, every schema can be listed.
• For methods, I copied the list from the promise schema and separated the sync and async methods properly. I think if a user needs to check the resolved value of a promise, the user will have to use the promise schema along with the awaitAsync action always. Then can proceed using any combination of schemas, methods and actions.

Let me know if the reasoning is flawed.

[fabian-hiller]

For schemas, it is straightforward, as I can use any schema after awaiting the promise schema. That means, every schema can be listed.

👍

For methods, I copied the list from thepromise schema and separated the sync and async methods properly...

I would only list the pipeAsync method. All other methods are not directly related to awaitAsync.

[fabian-hiller]

Thank you!