fix(major::pr): re-architect instrumentation library

llama_stack/providers/inline/instrumentation/otel/config.py

@@ -0,0 +1,27 @@
+# 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 typing import Literal
+
+from pydantic import BaseModel, Field
+
+
+class OTelConfig(BaseModel):
+    """
+    OpenTelemetry instrumentation configuration.
+
+    Most OTel settings use environment variables (OTEL_*).
+    See: https://opentelemetry.io/docs/specs/otel/configuration/sdk-configuration-variables/
+    """
+
+    service_name: str | None = Field(
+        default=None,
+        description="Service name (overridden by OTEL_SERVICE_NAME env var)",
+    )
+    span_processor: Literal["batch", "simple"] = Field(
+        default="batch",
+        description="Span processor type (overridden by OTEL_SPAN_PROCESSOR env var)",
+    )