feat(rust/catalyst-types): Add duplicate data error report

rust/catalyst-types/src/problem_report.rs

@@ -48,6 +48,13 @@ enum Kind {
         /// Explanation of the failed or problematic validation
         explanation: String,
     },
+    /// Duplicate field was detected.
+    DuplicateField {
+        /// The duplicated field.
+        field: String,
+        /// Additional information about the duplicate field.
+        description: String,
+    },
     /// An uncategorized problem was encountered. Use only for rare problems, otherwise
     /// make a new problem kind.
     Other {
@@ -337,6 +344,40 @@ impl ProblemReport {
         );
     }
 
+    /// Reports that duplicate field was detected in the problem report.
+    ///
+    /// This method adds an entry to the problem report indicating that duplicate field
+    /// is found, along with the description of the duplicate field and any additional
+    /// context.
+    ///
+    /// # Arguments
+    ///
+    /// * `field`: A string slice representing the value of the duplicate field.
+    /// * `description`: An additional information about the duplicate field.
+    /// * `context`: A string slice providing additional context or information about
+    ///   where and why this duplicate field was detected.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use catalyst_types::problem_report::ProblemReport;
+    /// let report = ProblemReport::new("RBAC Registration Decoding");
+    /// report.duplicate_field(
+    ///     "key 0",
+    ///     "key is already defined, redundant key found in item 6 in RBAC map",
+    ///     "RBAC purpose",
+    /// );
+    /// ```
+    pub fn duplicate_field(&self, field: &str, description: &str, context: &str) {
+        self.add_entry(
+            Kind::DuplicateField {
+                field: field.to_owned(),
+                description: description.to_owned(),
+            },
+            context,
+        );
+    }
+
     /// Reports an uncategorized problem with the given description and context.
     ///
     /// This method is intended for use in rare situations where a specific type of