Reorganized the validation code

[VisLab]

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[Copilot]

Pull request overview

This PR reorganizes schema validation code by moving compliance checking, attribute validators, and validation utilities into a new hed.schema.schema_validation subpackage while keeping backward-compatible shims for older import paths.

Changes:

• Added hed/schema/schema_validation/ package containing compliance checking, compliance summary reporting, HedID validation, attribute validators, and validation utilities.
• Replaced legacy modules (schema_compliance.py, schema_attribute_validators.py, schema_validation_util.py) with backward-compatible shims that re-export from the new package.
• Updated tests to import from the new locations and removed deprecated/legacy validation utilities and debug-only test scripts.

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/schema/test_schema_validator_hed_id.py	Update HedID validator import to new package path.
tests/schema/test_schema_validation_util.py	Update validation util import to new package path.
tests/schema/test_schema_compliance.py	Update compliance imports to new package path.
tests/schema/test_schema_attribute_validators.py	Update attribute validators import to new package path.
tests/schema/test_schema_validation_util_deprecated.py	Remove tests for deprecated legacy validation util.
spec_tests/_debug_dep_tests.py	Remove debug-only script.
hed/schema/schema_validation_util_deprecated.py	Remove deprecated legacy validation utilities.
hed/schema/schema_validation_util.py	Convert to shim re-exporting schema_validation.validation_util.
hed/schema/schema_validation/validation_util.py	New home for schema validation utility functions.
hed/schema/schema_validation/hed_id_validator.py	New HedID validator implementation under schema_validation.
hed/schema/schema_validation/compliance_summary.py	New structured compliance summary reporter.
hed/schema/schema_validation/compliance.py	New compliance checker implementation under schema_validation.
hed/schema/schema_validation/attribute_validators.py	New attribute validation functions under schema_validation.
hed/schema/schema_validation/init.py	Package exports for schema validation components.
hed/schema/schema_compliance_old.py	Remove old compliance implementation file.
hed/schema/schema_compliance.py	Convert to shim re-exporting schema_validation.compliance.
hed/schema/schema_attribute_validators.py	Convert to shim re-exporting schema_validation.attribute_validators.
hed/schema/hed_schema.py	Route HedSchema.check_compliance() through the new compliance module.

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