[amp-refactor][?/n] Add asset_condition argument to AssetsDefinition and friends

[OwenKephart]

Summary & Motivation

The plan is to allow users to supply AssetCondition objects instead of AutoMaterializePolicies. This PR makes that happen by turning the AutoMaterializePolicy class into a shell whose only purpose is to generate AssetConditions.

This meant that it had to be removed at the storage layer as well, as we want external asset nodes to be able to store regular AssetConditions. Luckily, it's fairly easy to ensure that AutoMaterializePolicies get deserialized as AssetConditions, as we already had some customized serialization going on in that part of the world.

How I Tested These Changes

[OwenKephart]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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Current dependencies on/for this PR:

• master
  • PR [amp-refactor][1/n] Update context objects #18612
    • PR [amp-refactor][2/n] Create snapshot class for condition objects #18613
      • PR [amp-refactor][3/n] RuleEvaluationData -> SubsetWithMetadata #18614
        • PR [amp-refactor][4/n] AssetAutomationCondition -> AssetCondition #18615
          • PR [amp-refactor][5/n] Whitelist AssetConditionEvaluation #18656
            • PR [amp-refactor][6/n] Simplify AssetConditionEvaluationContext #18684
              • PR [amp-refactor][7/n] Refactor AssetDaemonAssetCursor -> AssetConditionCursor #18953
                • PR [amp-refactor][8/n] Whitelist AssetDaemonCursor for serdes #18954
                  • PR [amp-refactor][9/n] Keep an accurate per-asset cursor #18775
                  • PR [amp-refactor][10/n] Improve backcompat logic #18871
                  • PR [amp-refactor][11/n] Create AssetConditionEvaluationResult object, remove AssetConditionCursorExtras #18804
                  • PR [amp-refactor][12/n] Return AssetConditionEvaluationResult from AutoMaterializeRule #18823
                  • PR [amp-refactor][13/n] Add start/end timestamps to evaluations #18956
                  • PR [amp-refactor][14/n] Fix non-subsettable multi-asset handling #19012
                  • PR [amp-refactor][15/n] Rename AssetConditionCursor -> AssetConditionEvaluationState #19035
                  • PR [amp-refactor][16/n] Re-enable legacy GQL queries #19081
                  • PR [amp-refactor][17/n] AssetConditionEvaluation GQL #18708
                  • PR [amp-refactor][?/n] Add asset_condition argument to AssetsDefinition and friends #18802 👈
              • PR [amp-refactor][OBSOLETE] #18693
                • PR [amp-refactor][OBSOLETE] #18719

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