Add standalone telemetry config + clang-format test fixes

Add docker/telemetry/xrpld-telemetry.cfg for local testing with the
observability stack. Apply clang-format corrections to
TraceContextPropagator test (include ordering, line wrapping).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pratikmankawde

docker/telemetry/xrpld-telemetry.cfg

@@ -0,0 +1,59 @@
+# Standalone xrpld configuration with OpenTelemetry enabled.
+#
+# Usage:
+#   1. Start the observability stack:
+#        docker compose -f docker/telemetry/docker-compose.yml up -d
+#   2. Run xrpld in standalone mode:
+#        ./xrpld --conf docker/telemetry/xrpld-telemetry.cfg -a --start
+#   3. Send RPC commands to exercise tracing:
+#        curl -s http://localhost:5005 -d '{"method":"server_info"}'
+#   4. View traces in Jaeger UI: http://localhost:16686
+
+[server]
+port_rpc_admin_local
+port_ws_admin_local
+
+[port_rpc_admin_local]
+port = 5005
+ip = 127.0.0.1
+admin = 127.0.0.1
+protocol = http
+
+[port_ws_admin_local]
+port = 6006
+ip = 127.0.0.1
+admin = 127.0.0.1
+protocol = ws
+
+[node_db]
+type=NuDB
+path=./data/nudb
+online_delete=256
+advisory_delete=0
+
+[database_path]
+./data
+
+[debug_logfile]
+./data/debug.log
+
+[rpc_startup]
+{ "command": "log_level", "severity": "debug" }
+
+[ssl_verify]
+0
+
+# --- OpenTelemetry tracing ---
+[telemetry]
+enabled=1
+endpoint=http://localhost:4318/v1/traces
+exporter=otlp_http
+sampling_ratio=1.0
+batch_size=512
+batch_delay_ms=5000
+max_queue_size=2048
+trace_rpc=1
+trace_transactions=1
+trace_consensus=1
+trace_peer=0
+trace_ledger=1