feat: pydantic V2

[khvn26]

• Bump pydantic to 2.3.0
• Bump pydantic collections to 0.5.1
• Change constrained type usage to annotated types
• Use computed_field for IdentityModel.composite_key
• Use correct model and field validators
• Use model_validate instead of parse_obj, model_dump instead if dict
• Acommodate for Pydantic V2 parsing str trait values to str
• Bump engine version to 5.0.0

[github-actions[bot]]

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