OwenKephart

[DS][20/n] Port static constructors from AssetCondition to SchedulingCondition

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## Summary & Motivation As title ## How I Tested These Changes

[DS][19/n] Create SchedulingCondition object to replace AssetCondition

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## Summary & Motivation Create a SchedulingCondition object which serves as a base class for AssetCondition (which will be removed entirely in the future). Replaces most uses of AssetCondition with...

[DS][18/n] Move serialized objects into separate file

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## Summary & Motivation As title ## How I Tested These Changes

[DS][17/n] Move legacy files to separate legacy folder

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## Summary & Motivation As title. Just reorganizing to clearly delineate what stuff is legacy ## How I Tested These Changes

[DS][16/n] Rename AssetConditionEvaluationContext to LegacyRuleEvaluationContext

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## Summary & Motivation As title. The previous name was confusing as it implies that this is more "core" than it really is ## How I Tested These Changes

[DS][15/n] Move operators to separate folder

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## Summary & Motivation Just organizing stuff a bit more -- in the past it's been very painful to scroll through a huge volume of files (or very large files)...

[DS][14/n] Remove unused methods and properties

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## Summary & Motivation As title. ## How I Tested These Changes

[DS][13/n] Convert SchedulingContext to DagsterModel

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## Summary & Motivation Makes a couple changes to allow using the DagsterModel class instead of dataclass ## How I Tested These Changes

[DS][12/n] Rename SchedulingContext object

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## Summary & Motivation Simple rename of SchedulingConditionEvaluationContext -> SchedulingContext ## How I Tested These Changes

[DS][25/n] Narrow extra_state type

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## Summary & Motivation As title -- we only need a subset of the full PackableValue type, and can always widen this later ## How I Tested These Changes