feat(core): More AWEL operators and new prompt manager API (#972)

Co-authored-by: csunny <cfqsunny@163.com>

examples/sdk/simple_sdk_llm_example.py

@@ -2,9 +2,11 @@ import asyncio
 from dbgpt.core.awel import DAG
 from dbgpt.core import (
     BaseOutputParser,
-    RequestBuildOperator,
     PromptTemplate,
+)
+from dbgpt.core.operator import (
     LLMOperator,
+    RequestBuildOperator,
 )
 from dbgpt.model import OpenAILLMClient
 

examples/sdk/simple_sdk_llm_sql_example.py

@@ -10,9 +10,11 @@ from dbgpt.core.awel import (
 )
 from dbgpt.core import (
     SQLOutputParser,
+    PromptTemplate,
+)
+from dbgpt.core.operator import (
     LLMOperator,
     RequestBuildOperator,
-    PromptTemplate,
 )
 from dbgpt.datasource.rdbms.conn_sqlite import SQLiteTempConnect
 from dbgpt.datasource.operator.datasource_operator import DatasourceOperator