Flow: allow grids as base models for StackedEnsemble

Description

Flow automatically filters keys corresponding to models compatible with the SE training_frame.

This fetching logic is done in FramesHandler#findCompatibleModels.

We may want to add a similar methods to find compatible grids as well (+ probably one parameter at the API level to activate this).

Also, the current filtering logic is pretty strict: all models should have been trained with a frame with all columns being present in the SE training_frame. We may want to loosen this restriction as it is not a true requirement for SE.

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Unassigned

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Reporter

Sebastien Poirier

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