Add sampling smoke tests

Author: mhlidd

.github/CODEOWNERS

@@ -14,6 +14,7 @@
 
 # @DataDog/apm-sdk-api-java
 /dd-java-agent/agent-otel                                       @DataDog/apm-sdk-api-java
+/dd-smoke-tests/sample-trace                                    @DataDog/apm-sdk-api-java
 /dd-trace-core/src/main/java/datadog/trace/core/baggage         @DataDog/apm-sdk-api-java
 /dd-trace-core/src/test/groovy/datadog/trace/core/baggage       @DataDog/apm-sdk-api-java
 /dd-trace-core/src/main/java/datadog/trace/core/propagation     @DataDog/apm-sdk-api-java