feat: add callback examples #359

Job	Run time
setup	5s
Wait State	1m 14s
Run in Child Context	58s
Step with Retry	1m 7s
Callback	1m 2s
Steps with Retry	1m 13s
Step with Name	57s
Basic Step	57s
Hello World	1m 7s
Multiple Wait	1m 15s
Block Example	1m 3s
Map with Min Successful	1m 3s
Simple Execution	1m 5s
Parallel Operations	1m 1s
Map Operations	1m 11s
Map with Max Concurrency	1m 13s
Wait for Condition	1m 2s
Parallel with Batch SerDes	1m 2s
Parallel with Failure Tolerance	58s
Parallel with Max Concurrency	1m 1s
Run in Child Context Large Data	1m 3s
Map with Failure Tolerance	1m 5s
Parallel with Custom SerDes	56s
Logger Example	1m 11s
Map with Custom SerDes	1m 7s
Handler Error	1m 1s
Map with Batch SerDes	1m 10s
Parallel with Wait	1m 16s
	29m 23s

Provide feedback