Feature: Callback should have access to the pipeline?

[vincent-antaki]

As 0.5.8 version will be release, callbacks interface will now contain the ExecutionContext. This will allow them usage of the service, which will open up many possibilities (such as accessing services which are used as cached, as to derive metrics from them). Eventually, we may want to consider passing the pipeline as to facilitate access computing more complex metrics or access specific step state.

[guillaume-chevalier]

Note: maybe the pipeline is already in context.parents. Not sure, however, as it maybe not have been pushed there yet, or it could have been popped otherwise as well.

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