add enum name mapping feature to the rust generators (#17290)

bin/configs/rust-reqwest-petstore.yaml

@@ -6,3 +6,5 @@ templateDir: modules/openapi-generator/src/main/resources/rust
 additionalProperties:
   supportAsync: false
   packageName: petstore-reqwest
+enumNameMappings:
+  delivered: shipped

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRustCodegen.java

@@ -285,9 +285,12 @@ public abstract class AbstractRustCodegen extends DefaultCodegen implements Code
     }
 
     //// Enum naming ////
-
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (enumNameMapping.containsKey(name)) {
+            return enumNameMapping.get(name);
+        }
+
         // Empty strings need to be mapped to "Empty"
         // https://github.com/OpenAPITools/openapi-generator/issues/13453
         if (Strings.isNullOrEmpty(name)) {

samples/client/petstore/rust/reqwest/petstore/src/models/order.rs

@@ -51,7 +51,7 @@ pub enum Status {
     #[serde(rename = "approved")]
     Approved,
     #[serde(rename = "delivered")]
-    Delivered,
+    shipped,
 }
 
 impl Default for Status {