Self-paced-training tutorial: Chapter 6: Security

[chesterxgchen]

Description

Chapter 6: Related to the Security aspect of NVFLARE
I completed most of the sections except the following
* Message serialization -- FOBs
* Unsafe components
* Audit log

There are few issues encountered
* Federated Policy -- original example using provision, I could follow the same approach, but I was hoping to use POC mode to simplify the process, but there are some issues (bugs) related to the nvflare poc -i project.yml
* some strange error when running jobs -- but not in others machine

But I think the first few sections can merged in, I will finish the remaining section after 1-week

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Quick tests passed locally by running ./runtest.sh.
• In-line docstrings updated.
• Documentation updated.