Add `ParIterable#tapEach` method

[java-coding-prodigy]

ParIterable does not have a tapEach method unlike the normal scala interface.
We should implement this

[yzia2000]

Yeah this sounds useful if we want to parallelize side effects. Though the work doesn't seem that simple

[java-coding-prodigy]

We have map and for each, can’t we just make a tapEach in the same way?

[SethTisue]

We have map and for each, can’t we just make a tapEach in the same way?

Yes, a PR on this would be most welcome