Add mapping option to Ada client/server codegen

bin/configs/ada.yaml

@@ -0,0 +1,15 @@
+generatorName: ada
+outputDir: samples/client/petstore/ada
+inputSpec: modules/openapi-generator/src/test/resources/3_0/ada/petstore.yaml
+templateDir: modules/openapi-generator/src/main/resources/Ada
+nameMappings:
+  _type: P_UnderscoreType
+  type_: P_TypeWithUnderscore
+  http_debug_operation: P_HTTPDebugOperation
+parameterNameMappings:
+  _type: UnderscoreType
+  type_: TypeWithUnderscore
+  http_debug_operation: HttpDebugOperation 
+additionalProperties:
+  modelPackage: Samples.Petstore
+  projectName: Petstore

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

@@ -364,11 +364,21 @@ public String toOperationId(String operationId) {
 
     @Override
     public String toVarName(String name) {
+        // obtain the name from nameMapping directly if provided
+        if (nameMapping.containsKey(name)) {
+            return nameMapping.get(name);
+        }
+
         return toAdaIdentifier(sanitizeName(name), "P_");
     }
 
     @Override
     public String toParamName(String name) {
+        // obtain the name from parameterNameMapping directly if provided
+        if (parameterNameMapping.containsKey(name)) {
+            return parameterNameMapping.get(name);
+        }
+
         return toAdaIdentifier(super.toParamName(name), "P_");
     }
 
@@ -833,7 +843,6 @@ public int compareTo(ModelDepend second) {
 
     @Override
     public ModelsMap postProcessModels(ModelsMap objs) {
-
         // This is run first, before the operations.
         // remove model imports to avoid error
         List<Map<String, String>> imports = objs.getImports();