This PR does the following three things:
1. Defines a high-level interface for this wasm package
- All return value from this package will be wrapped with an
result object that contains a value field and an error field
2. Exposes two new functions to allow users to add permissions for a
given API key
- newPermission()
- setAPIKeyPermission()
3. Adds API documentation for the newly added API functions
Change-Id: Id995189702b369bba18fa344bef4ddfb0f3f1f44
