Suppress verbose gRPC C-core logging in nvidia services

Set GRPC_VERBOSITY=ERROR by default so users do not see noisy fork
handler and abseil warnings from the gRPC C library. Users can still
override by setting GRPC_VERBOSITY themselves.

src/pipecat/services/nvidia/__init__.py

@@ -0,0 +1,12 @@
+#
+# Copyright (c) 2024-2026, Daily
+#
+# SPDX-License-Identifier: BSD 2-Clause License
+#
+
+import os
+
+# Suppress verbose gRPC C-core logging (fork handlers, abseil warnings) unless
+# the user has explicitly configured it.
+if "GRPC_VERBOSITY" not in os.environ:
+    os.environ["GRPC_VERBOSITY"] = "ERROR"