feat(tests): make inference_recorder into api_recorder (include tool_invoke) (#3403)

Renames `inference_recorder.py` to `api_recorder.py` and extends it to
support recording/replaying tool invocations in addition to inference
calls.

This allows us to record web-search, etc. tool calls and thereafter
apply recordings for `tests/integration/responses`

## Test Plan

```
export OPENAI_API_KEY=...
export TAVILY_SEARCH_API_KEY=...

./scripts/integration-tests.sh --stack-config ci-tests \
   --suite responses --inference-mode record-if-missing
```

llama_stack/core/id_generation.py

@@ -0,0 +1,42 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from collections.abc import Callable
+
+IdFactory = Callable[[], str]
+IdOverride = Callable[[str, IdFactory], str]
+
+_id_override: IdOverride | None = None
+
+
+def generate_object_id(kind: str, factory: IdFactory) -> str:
+    """Generate an identifier for the given kind using the provided factory.
+
+    Allows tests to override ID generation deterministically by installing an
+    override callback via :func:`set_id_override`.
+    """
+
+    override = _id_override
+    if override is not None:
+        return override(kind, factory)
+    return factory()
+
+
+def set_id_override(override: IdOverride) -> IdOverride | None:
+    """Install an override used to generate deterministic identifiers."""
+
+    global _id_override
+
+    previous = _id_override
+    _id_override = override
+    return previous
+
+
+def reset_id_override(previous: IdOverride | None) -> None:
+    """Restore the previous override returned by :func:`set_id_override`."""
+
+    global _id_override
+    _id_override = previous