Add type hints to analyzer.py

This change adds type annotations and necessary imports to the
examples/google-ads-account-analyzer-demo/analyzer.py script.

Type hints were added to the following functions:
- account_hierarchy_module
- print_account_hierarchy
- get_users_module

I verified the annotations, and one issue related to an
untyped dictionary was fixed. Remaining errors originate from the
google-ads library itself.

Author: google-labs-jules[bot]

examples/google-ads-account-analyzer-demo/analyzer.py

@@ -17,14 +17,15 @@
 
 import argparse
 import sys
+from typing import Optional, Dict, List, Any
 
 from google.ads.googleads.client import GoogleAdsClient
 from google.ads.googleads.errors import GoogleAdsException
 
 _DEFAULT_LOG_SPACE_LENGTH = 4
 
 
-def account_hierarchy_module(google_ads_client, customer_id):
+def account_hierarchy_module(google_ads_client: GoogleAdsClient, customer_id: Optional[str]):
     """Print the account hierarchy for the given login customer ID.
 
     Args:
@@ -74,7 +75,7 @@ def account_hierarchy_module(google_ads_client, customer_id):
         # Performs a breadth-first search to build a Dictionary that maps
         # managers to their child accounts (customer_ids_to_child_accounts).
         unprocessed_customer_ids = [seed_customer_id]
-        customer_ids_to_child_accounts = dict()
+        customer_ids_to_child_accounts: Dict[str, List[Any]] = dict()
         root_customer_client = None
 
         while unprocessed_customer_ids:
@@ -129,7 +130,7 @@ def account_hierarchy_module(google_ads_client, customer_id):
 
 
 def print_account_hierarchy(
-    customer_client, customer_ids_to_child_accounts, depth
+    customer_client: Any, customer_ids_to_child_accounts: Dict[str, List[Any]], depth: int
 ):
     """Prints the specified account's hierarchy using recursion.
 
@@ -157,7 +158,7 @@ def print_account_hierarchy(
             )
 
 
-def get_users_module(google_ads_client, customer_id):
+def get_users_module(google_ads_client: GoogleAdsClient, customer_id: Optional[str]):
     """Prints the user access information for the given customer_id.
 
     Args: