[pick] [data] Rename .cache() to .materialize() (#34169) #34184
Merged
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Based on discussion with @c21 @jjyao , as well as the new "MaterializedDatastream" class name, materialize makes more sense as an action than cache. Furthermore, we don't need an is_cached method as the new type information suffices.
Why are these changes needed?
This picks #34169 into 2.4. We need to do this pick since this is a last minute rename of a new API in 2.4. Otherwise, we'd have to immediately deprecate the API in 2.5.