Lazy `iris.experimental.stratify.relevel`

[bouweandela]

✨ Feature Request

Motivation

Now that python-stratify supports lazy data (https://github.com/SciTools/python-stratify/pull/52) since v0.3, it would be nice if iris.experimental.stratify.relevel supported lazy data too, so the new feature can be used with iris.

At the moment, the input cube is realized here: https://github.com/SciTools/iris/blob/a49b5acfe4038fe6224e907f352bb936240a60d1/lib/iris/experimental/stratify.py#L129

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[trexfeathers]

@HGWright thoughts?