Input/OutputContext.asset_key
Summary: When an asset_key is supplied to an InputDefinition or OutputDefinition, this enables accessing it from an InputContext or OutputContext. This allows input/output def asset key to be used in the underlying implementation of software-defined assets.
Test Plan: bk
Reviewers: cdecarolis, owen
Reviewed By: owen
Differential Revision: https://dagster.phacility.com/D9226