Remove Partial<> from Parameterised type for Worker (complete.success)

[jwulf]

At the moment, the worker completion payload is a Partial. However, this erases type safety for required parameters.

If a programmer really has a Partial, they can put that in the signature.

Changing this will break the compilation of any code that uses type parameters on createWorker, if it relies on the existing implicit Partial<T>.

I don't think many people are using that at the moment - I'll check in Slack.

The benefit of making this change for type safety is significant, and the refactoring to fix the breaking change in users' code is T -> Partial<T> which is minimal and deterministic.

For example:

zbc.createWorker<INpmPackageQuery, {}, IndividualResult>

if the worker really returns only part of the IndividualResult type, it will need to be refactored to:

zbc.createWorker<INpmPackageQuery, {}, Partial<IndividualResult>>

The change needs to be made here: https://github.com/zeebe-io/zeebe-client-node-js/blob/master/src/lib/ZBWorkerBase.ts#L275