remove value field from Result objects 'meta' key
🚀 Feature

remove value field from Result objects 'meta' key
Motivation

The value field in the Result obj's  meta data is

a duplicate of the raw data in the Result obj,
not being used,
not updated in the gathered results presented to the user in [training,validation,test]_epoch_end.

Especially this last point can lead to confusion.
Pitch

The value field should no longer be written to the meta data in the Result obj.
I can submit a PR if this change is approved.