Pipe should implement PipeTransform interface

[EmmanuelDemey]

Just add the PipeTransform interface that should be used when creating pipe

[filipesilva]

Tested and lgtm

/cc @cironunes@Brocco

[cironunes]

Needs to be rebased against current master, otherwise lgtm

[cironunes]

Also, please make sure to follow the commit message guidelines

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