Fix the tracing_level_info feature in tonic-tracing-otel

Author: 23Skidoo

tonic-tracing-opentelemetry/Cargo.toml

@@ -63,4 +63,6 @@ opentelemetry_sdk = { workspace = true, features = [
 [features]
 default = []
 # to use level `info` instead of `trace` to create otel span
-tracing_level_info = []
+tracing_level_info = [
+  "tracing-opentelemetry-instrumentation-sdk/tracing_level_info",
+]