The previous pattern used async methods for the builder pattern,
which were hideous to use when chained multiple times.
This extracts the builder into a separate class
and uses normal functions in the builder.
These queue async functions in arrays, which are executed
at the correct time, when the new async `build` function is called.
Signed-off-by: David Mehren <git@herrmehren.de>
To make the create method easier to use in conjunction
with the authentication framework, this commit changes the type of
the `owner` parameter from `User | undefined` to `User | null`.
Signed-off-by: David Mehren <git@herrmehren.de>
