Support OAS uniqueItems property as Attribute Validator

[austinvalle]

Reference: https://json-schema.org/draft/2020-12/json-schema-validation.html#name-uniqueitems

When uniqueitems is defined with an array type, should generate the following specification:

"validators": [
  {
    "custom": {
      "import": "github.com/hashicorp/terraform-plugin-framework-validators/listvalidator",
      "schema_definition": "listvalidator.UniqueValues()"
    }
  }
]

[github-actions]

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