Add ability to Stack datasets

Description

We currently have h2o.pivot(), but it would also be nice to have stack function so that users have the flexibility to stack and unstack their dataframes. Example code can be found the stack link.

note: from "the h2oEnsemble package already has a `h2o.stack()` function in R. but if we do add this function to R with this name, i think it will be okay since people would load the h2oEnsemble package and probably that namespace would override h2o".

original request comes from h2o stream here

Assignee

New H2O Bugs

Fix versions

None

Reporter

Lauren DiPerna

Support ticket URL

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No

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Priority

Minor
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