Allow to add custom `TaskOrchestrationFactory` and `TaskActivityFactory` factories
# Context
The current API does not allow a custom `TaskOrchestrationFactory` and `TaskActivityFactory`, when creating a `DurableTaskGrpcWorker` through:
```java
public DurableTaskGrpcWorker build() {
return new DurableTaskGrpcWorker(this);
}
```
# Proposal
It would be great, if we have a way to add custom factories to load `WorkflowActivity` or `Workflow` implementations through other mechanism, like CDI, by example.
## Possible implementation
To change the `WorkflowRuntimeBuilder` builder adding a new method that adds a custom factories.
For example:
```java
public <T extends WorkflowActivity> WorkflowRuntimeBuilder registerTaskActivityFactory(String activityName, TaskActivityFactory taskActivityFactory) {
return null;
}
public <T extends Workflow> WorkflowRuntimeBuilder registerTaskOrchestrationFactory(String orchestrationName, TaskOrchestrationFactory taskOrchestrationFactory) {
return null;
}
```
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