Let fluent setters of SimpleStepBuilder return proper type

[hpoettker]

Let fluent setters of SimpleStepBuilder return this with type SimpleStepBuilder. This makes the required order of some fluent setters a bit more lenient and prevents that AbstractTaskletStepBuilder::listener for parameters of type Object is invoked although an overloaded method specific for SimpleStepBuilder is intended.

Fixes #773 and #1098.

[hpoettker]

I rebased the original commit on the current main branch.

I also added a commit that is functionally the same but uses less unchecked casts. It's a bit cleaner but also a bit noisier as it touches more classes.

[SebastianGoeb]

Is this PR still active? I've also encountered the listener issue #773 , and would love to see this change merged.

[hpoettker]

From my side, I'd definitely consider this PR active. If it needs work, I'll be happy to do it.

The listener method on the DSL can be confusing. And I think this PR would really help in this regard.

[hpoettker]

I fixed the merge conflict that arised mainly from #4118 for the main branch.

There are now at least three open issues that are addressed by this PR: #773, #1098, and #3686. And I'd also consider it as having votes from the community.

It would be great to have a target release assigned to this.

[fmbenhassine]

Rebased, squashed and merged as d280556. Thank you for your contribution!