feat: add Spanner first-party toolset (breaking change to BigQueryTool, consolidating into generic GoogleTool)

Spanner toolset support basic operations to interact with Spanner table metadata and query results.

Consolidate BigQueryTool into generic GoogleTool, so that BigQueryToolset and SpannerToolset can share.

PiperOrigin-RevId: 794259782

tests/unittests/tools/bigquery/test_bigquery_toolset.py

@@ -15,8 +15,9 @@
 from __future__ import annotations
 
 from google.adk.tools.bigquery import BigQueryCredentialsConfig
-from google.adk.tools.bigquery import BigQueryTool
 from google.adk.tools.bigquery import BigQueryToolset
+from google.adk.tools.bigquery.config import BigQueryToolConfig
+from google.adk.tools.google_tool import GoogleTool
 import pytest
 
 
@@ -30,12 +31,18 @@ async def test_bigquery_toolset_tools_default():
   credentials_config = BigQueryCredentialsConfig(
       client_id="abc", client_secret="def"
   )
-  toolset = BigQueryToolset(credentials_config=credentials_config)
+  toolset = BigQueryToolset(
+      credentials_config=credentials_config, bigquery_tool_config=None
+  )
+  # Verify that the tool config is initialized to default values.
+  assert isinstance(toolset._tool_settings, BigQueryToolConfig)  # pylint: disable=protected-access
+  assert toolset._tool_settings.__dict__ == BigQueryToolConfig().__dict__  # pylint: disable=protected-access
+
   tools = await toolset.get_tools()
   assert tools is not None
 
   assert len(tools) == 5
-  assert all([isinstance(tool, BigQueryTool) for tool in tools])
+  assert all([isinstance(tool, GoogleTool) for tool in tools])
 
   expected_tool_names = set([
       "list_dataset_ids",
@@ -77,7 +84,7 @@ async def test_bigquery_toolset_tools_selective(selected_tools):
   assert tools is not None
 
   assert len(tools) == len(selected_tools)
-  assert all([isinstance(tool, BigQueryTool) for tool in tools])
+  assert all([isinstance(tool, GoogleTool) for tool in tools])
 
   expected_tool_names = set(selected_tools)
   actual_tool_names = set([tool.name for tool in tools])
@@ -114,7 +121,7 @@ async def test_bigquery_toolset_unknown_tool(selected_tools, returned_tools):
   assert tools is not None
 
   assert len(tools) == len(returned_tools)
-  assert all([isinstance(tool, BigQueryTool) for tool in tools])
+  assert all([isinstance(tool, GoogleTool) for tool in tools])
 
   expected_tool_names = set(returned_tools)
   actual_tool_names = set([tool.name for tool in tools])