Annotate braintree's ClientToken and ClientTokenGateway (#14926)

Author: cuu508

stubs/braintree/braintree/client_token.pyi

@@ -1,5 +1,9 @@
+from _typeshed import Incomplete
+
+from braintree.braintree_gateway import BraintreeGateway
+
 class ClientToken:
     @staticmethod
-    def generate(params=None, gateway=None): ...
+    def generate(params: dict[str, Incomplete] | None = None, gateway: BraintreeGateway | None = None) -> str: ...
     @staticmethod
     def generate_signature() -> list[str | dict[str, list[str]]]: ...

stubs/braintree/braintree/client_token_gateway.pyi

@@ -1,7 +1,9 @@
 from _typeshed import Incomplete
 
+from braintree.braintree_gateway import BraintreeGateway
+
 class ClientTokenGateway:
-    gateway: Incomplete
+    gateway: BraintreeGateway
     config: Incomplete
-    def __init__(self, gateway) -> None: ...
-    def generate(self, params=None): ...
+    def __init__(self, gateway: BraintreeGateway) -> None: ...
+    def generate(self, params: dict[str, Incomplete] | None = None) -> str: ...