chore(examples): remove deprecated class and function from examples. (aws#258)

Author: dhegberg

examples/src/main/java/software/amazon/lambda/durable/examples/CustomPollingExample.java

@@ -39,7 +39,7 @@ public String handleRequest(GreetingRequest input, DurableContext context) {
         context.getLogger().info("Starting workflow with input: {}", input);
 
         // Step 1: low case the input
-        var lowered = context.stepAsync("validate", String.class, () -> {
+        var lowered = context.stepAsync("validate", String.class, stepCtx -> {
             try {
                 // prevent the execution from suspension
                 Thread.sleep(5000);

examples/src/main/java/software/amazon/lambda/durable/examples/RetryExample.java

@@ -8,7 +8,7 @@
 import org.slf4j.LoggerFactory;
 import software.amazon.lambda.durable.DurableContext;
 import software.amazon.lambda.durable.DurableHandler;
-import software.amazon.lambda.durable.StepConfig;
+import software.amazon.lambda.durable.config.StepConfig;
 import software.amazon.lambda.durable.retry.RetryStrategies;
 
 /**