examples: Add wait_for_callback examples #409

Job	Run time
setup	5s
Basic Step	1m 1s
Hello World	1m 5s
Step with Retry	1m 10s
Multiple Wait	1m 8s
Callback	56s
Step with Name	57s
Wait for Callback Success	1m 4s
Wait For Callback Success Anonymous	1m 1s
Wait For Callback Heartbeat Sends	1m 51s
Wait For Callback Multiple Invocations	59s
Wait For Callback With Child Context	1m 7s
Wait for Callback Failure	1m 1s
Wait For Callback Failing Submitter Catchable	1m 7s
Wait For Callback Serdes	1m 6s
Wait For Callback Mixed Ops	1m 4s
Block Example	58s
Logger Example	58s
Map Large Scale	1m 7s
Wait For Callback Submitter Failure	1m 23s
Wait For Callback Nested	1m 12s
Run in Child Context	1m 1s
Run in Child Context Large Data	1m 15s
Map with Max Concurrency	59s
Wait for Condition	58s
Map Operations	1m 5s
Map with Failure Tolerance	1m 5s
Parallel with Max Concurrency	58s
Simple Execution	1m 3s
Wait State	1m 6s
Parallel with Custom SerDes	1m 0s
Parallel with Wait	1m 0s
Parallel with Failure Tolerance	1m 8s
Map with Min Successful	55s
Handler Error	59s
Parallel with Batch SerDes	53s
Map with Batch SerDes	52s
Parallel Operations	57s
Steps with Retry	1m 12s
Map with Custom SerDes	1m 6s
None Results	57s
	42m 49s

Provide feedback