Make SdkLogEmitterBuilder final

Author: jack-berg

sdk/logs/src/main/java/io/opentelemetry/sdk/logs/SdkLogEmitterBuilder.java

@@ -8,7 +8,7 @@
 import io.opentelemetry.sdk.internal.ComponentRegistry;
 import javax.annotation.Nullable;
 
-class SdkLogEmitterBuilder implements LogEmitterBuilder {
+final class SdkLogEmitterBuilder implements LogEmitterBuilder {
 
   private final ComponentRegistry<SdkLogEmitter> registry;
   private final String instrumentationName;