Generalize flat container implementations to less specific regions #518
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This change redefines some trait implementations in differential for flat containers to be in terms of regions fulfilling some requirements instead of specific regions. The current implementation makes it impossible to implement the traits for specific regions due to Rust's orphan rules, which blocks us from using custom region implementations in Materialize.
The change should be localized to traits and implementations related to flat container. It includes some overdue renaming to make traits and generic parameters slightly more understandable.