Fix stdout traceexporter to show scope attributes

opentelemetry-stdout/CHANGELOG.md

@@ -6,6 +6,7 @@
 
 ### Changed
 
+- TraceExporter fixed to print InstrumentationScope's attributes.
 - Fix StatusCode in stdout exporter [#1454](https://github.com/open-telemetry/opentelemetry-rust/pull/1454)
 - Add missing event timestamps [#1391](https://github.com/open-telemetry/opentelemetry-rust/pull/1391)
 - Adjusted `chrono` features to reduce number of transitive dependencies. [#1569](https://github.com/open-telemetry/opentelemetry-rust/pull/1569)

opentelemetry-stdout/src/common.rs

@@ -234,7 +234,7 @@
         Scope {
             name: value.name,
             version: value.version,
-            attributes: Vec::new(),
+            attributes: value.attributes.into_iter().map(Into::into).collect(),
             dropped_attributes_count: 0,
         }
     }