chore: Add pylint for DB-GPT core lib (#1076)

.mypy.ini

@@ -0,0 +1,20 @@
+[mypy]
+exclude = /tests/
+# plugins = pydantic.mypy
+
+[mypy-graphviz.*]
+ignore_missing_imports = True
+
+[mypy-cachetools.*]
+ignore_missing_imports = True
+
+[mypy-coloredlogs.*]
+ignore_missing_imports = True
+
+[mypy-termcolor.*]
+ignore_missing_imports = True
+
+[mypy-pydantic.*]
+strict_optional = False
+ignore_missing_imports = True
+follow_imports = skip