[FEATURE]: Data Contract Implicit Checks to Include Schema Validation

[vb-dbrks]

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Problem statement

the data contracts to dqx check generator should also generate schema validation checks based on what's defined in the ODCS data contracts

Proposed Solution

1. Add a schema validation rule type: for each ODCS schema, generate one dataset-level rule that calls has_valid_schema with the expected schema derived from the contract (column names and Unity Catalog physicalTypes).
2. Use strict mode only: exact column set, order, and types (no permissive/type-widening).
3. Require every property to have Unity Catalog physicalType (e.g. STRING, INT, DECIMAL(10,2), ARRAY<STRING>). No ODCS→Unity mapping; missing or invalid physicalType raises an error.
4. Make it opt-in by default: new parameter generate_schema_validation=True; set to False to skip these rules.
5. Emit rules with user_metadata.rule_type: "schema_validation" and the expected DDL string so they can be filtered or reported separately.

Additional Context

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