Feature Request: More information in the messages of PipelineApplicationError

[shaypal5]

At the moment, there is too little information in the messages of PipelineApplicationError.

Things that should be added:

1. The type of the pipeline stage (so the name of the class).
   1.1. Actually, maybe the description?! :)
2. The index in the pipeline (obviously only when part of a pipeline; requires catching and rethrowing at the pipeline level).
3. The label of the pipeline stage, when Feature suggestion: Add stage labels #19 is implemented.

[humblefool1997]

@shaypal5 I would like to work on this issue

[shaypal5]

That's great! Go ahead. :)

[naveenkaushik2504]

I'd like to work on this issue. Have gone through the code to make the necessary changes. Will submit a PR soon. Hope this functionality is still desired.

[shaypal5]

Great! Yeah, I'm still waiting for it. :)

[shaypal5]

Close with #38 !
Hooray @naveenkaushik2504 !