chore: GenAI Client - refactor types, update descriptions

PiperOrigin-RevId: 883441302

Author: jsondai

vertexai/_genai/types/__init__.py

@@ -2141,12 +2141,6 @@
     "OptimizeResponse",
     "OptimizeResponseDict",
     "OptimizeResponseOrDict",
-    "PromptTemplate",
-    "PromptTemplateDict",
-    "PromptTemplateOrDict",
-    "EvalRunInferenceConfig",
-    "EvalRunInferenceConfigDict",
-    "EvalRunInferenceConfigOrDict",
     "ContentMapContents",
     "ContentMapContentsDict",
     "ContentMapContentsOrDict",
@@ -2156,18 +2150,24 @@
     "EvaluateDatasetConfig",
     "EvaluateDatasetConfigDict",
     "EvaluateDatasetConfigOrDict",
-    "EvaluateDatasetRequestParameters",
-    "EvaluateDatasetRequestParametersDict",
-    "EvaluateDatasetRequestParametersOrDict",
     "EvaluateDatasetOperation",
     "EvaluateDatasetOperationDict",
     "EvaluateDatasetOperationOrDict",
+    "EvaluateDatasetRequestParameters",
+    "EvaluateDatasetRequestParametersDict",
+    "EvaluateDatasetRequestParametersOrDict",
     "ObservabilityEvalCase",
     "ObservabilityEvalCaseDict",
     "ObservabilityEvalCaseOrDict",
     "RubricGroup",
     "RubricGroupDict",
     "RubricGroupOrDict",
+    "PromptTemplate",
+    "PromptTemplateDict",
+    "PromptTemplateOrDict",
+    "EvalRunInferenceConfig",
+    "EvalRunInferenceConfigDict",
+    "EvalRunInferenceConfigOrDict",
     "AgentEngine",
     "AgentEngineDict",
     "AgentEngineOrDict",