refactor(client, session): optional ClientTelemetry, default retrieval from singleton instance

Author: teocns

agentops/client.py

@@ -236,6 +236,7 @@ def start_session(
             session_tags.update(tags)
 
         session = Session(
+            client=self._telemetry,
             session_id=session_id,
             tags=list(session_tags),
             host_env=self.host_env,

agentops/session.py

@@ -9,6 +9,7 @@
 from typing import Any, Dict, List, Optional, Sequence, Union
 from uuid import UUID, uuid4
 
+from agentops.client import Client
 from opentelemetry import trace
 from opentelemetry.context import attach, detach, set_value
 from opentelemetry.sdk.resources import SERVICE_NAME, Resource
@@ -201,7 +202,7 @@ def __init__(
         self,
         session_id: UUID,
         config: Configuration,
-        client: ClientTelemetry,
+        client: Optional[ClientTelemetry] = Client()._telemetry, # Not mandatory, we can use the Client singleton to retrieve the telemetry client
         tags: Optional[List[str]] = None,
         host_env: Optional[dict] = None,
     ):