Schema and DataStructure functionality is unified

[aaronjensen]

Summary

Unifies Schema and Schema::DataStructure functionality into a single Schema module while maintaining backward compatibility.

Changes

• Enhanced Schema module: Added build(), transform_read/write, configure, deep_copy methods
• Simplified DataStructure: Now a deprecated wrapper that includes Schema
• Unified test controls: Consolidated under Schema::Controls::Schema
• Updated documentation: Reflects unified Schema interface
• Full backward compatibility: Existing Schema::DataStructure code continues to work with deprecation warning

Test plan

• All existing tests pass with unified functionality
• DataStructure wrapper still works but shows deprecation warning
• Schema now provides superset of all functionality
• Test controls consolidated and working properly

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