LLM Tools support for Google Generative AI integration (#117644)

* initial commit

* Undo prompt chenges

* Move format_tool out of the class

* Only catch HomeAssistantError and vol.Invalid

* Add config flow option

* Fix type

* Add translation

* Allow changing API access from options flow

* Allow model picking

* Remove allowing HASS Access in main flow

* Move model to the top in options flow

* Make prompt conditional based on API access

* convert only once to dict

* Reduce debug logging

* Update title

* re-order models

* Address comments

* Move things

* Update labels

* Add tool call tests

* coverage

* Use LLM APIs

* Fixes

* Address comments

* Reinstate the title to not break entity name

---------

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

tests/helpers/test_llm.py

@@ -18,12 +18,13 @@ async def test_get_api_no_existing(hass: HomeAssistant) -> None:
 
 async def test_register_api(hass: HomeAssistant) -> None:
     """Test registering an llm api."""
-    api = llm.AssistAPI(
-        hass=hass,
-        id="test",
-        name="Test",
-        prompt_template="Test",
-    )
+
+    class MyAPI(llm.API):
+        def async_get_tools(self) -> list[llm.Tool]:
+            """Return a list of tools."""
+            return []
+
+    api = MyAPI(hass=hass, id="test", name="Test", prompt_template="")
     llm.async_register_api(hass, api)
 
     assert llm.async_get_api(hass, "test") is api