add type hints for base acquisition get/set functions

Author: adrianmolzon

bayes_opt/acquisition.py

@@ -109,7 +109,7 @@ def _fit_gp(self, gp: GaussianProcessRegressor, target_space: TargetSpace) -> No
             if target_space.constraint is not None:
                 target_space.constraint.fit(target_space.params, target_space._constraint_values)
 
-    def get_acquisition_params(self):
+    def get_acquisition_params(self) -> dict[str, Any] | NoReturn:
         """
         Get the parameters of the acquisition function.
 
@@ -123,7 +123,7 @@ def get_acquisition_params(self):
         )
         raise NotImplementedError(error_msg)
 
-    def set_acquisition_params(self, **params):
+    def set_acquisition_params(self, **params) -> None | NoReturn:
         """
         Set the parameters of the acquisition function.