[feature] Relationship definition validator

[PragalvaXFREZ]

Description:

Meshery currently has nearly no way to validate relationship definitions. We need a validator that can be reused accross:

• mesheryctl relationship validate command
• Model import pipeline
• Model build pipeline

The validator should support:

• Schema validation (required fields, enums, types)
• Cross-field semantic checks (taxonomy, selector structure, mutatorRef/mutatedRef parity)
• Model-aware validation (verifying selector component kinds exist in the model)

Notes

• meshkit is currently on schemas v0.8.113, the validator will be based upon the latest schema release, so a version bump will be needed for the validator to work
• For more information read: https://docs.google.com/document/d/1K4XQaMjJQ-1OpjTiCy1ac9Kh1IkhU4XAr4C0j9rDdqg/edit?usp=sharing

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[PragalvaXFREZ]

Closed by: #932