fix the return types of the classes' __enter__ functions (#384)

fix the return types of the classes' __enter__ functions so that the type information is preserved in context managers eg with-as blocks

Signed-off-by: wyattscarpenter <wyattscarpenter@gmail.com>
Signed-off-by: Sai Shree Pradhan <saishree.pradhan@databricks.com>

Author: wyattscarpenter

src/databricks/sql/client.py

@@ -271,7 +271,8 @@ def _set_use_inline_params_with_warning(self, value: Union[bool, str]):
 
         return value
 
-    def __enter__(self):
+    # The ideal return type for this method is perhaps Self, but that was not added until 3.11, and we support pre-3.11 pythons, currently.
+    def __enter__(self) -> "Connection":
         return self
 
     def __exit__(self, exc_type, exc_value, traceback):
@@ -409,7 +410,8 @@ def __init__(
         self.escaper = ParamEscaper()
         self.lastrowid = None
 
-    def __enter__(self):
+    # The ideal return type for this method is perhaps Self, but that was not added until 3.11, and we support pre-3.11 pythons, currently.
+    def __enter__(self) -> "Cursor":
         return self
 
     def __exit__(self, exc_type, exc_value, traceback):