perf(tracing): short circuit matching baggage key values

Signed-off-by: Reto <[email protected]>

Author: rethab

micrometer-tracing/src/main/java/io/micrometer/tracing/handler/RevertingScope.java

@@ -110,6 +110,11 @@ private static Collection<KeyValue> matchingBaggageKeyValues(Tracer tracer, Cont
         for (String remoteField : tracer.getBaggageFields()) {
             lowerCaseRemoteFields.add(remoteField.toLowerCase());
         }
+
+        if (lowerCaseRemoteFields.isEmpty()) {
+            return Collections.emptyList();
+        }
+
         Collection<KeyValue> baggageKeyValues = new ArrayList<>();
         for (KeyValue keyValue : context.getAllKeyValues()) {
             if (lowerCaseRemoteFields.contains(keyValue.getKey().toLowerCase())) {