feat: generating appData without `app-data` SDK

[mfw78]

Problem

A lesson from Devconnect was that generating the app-data when doing smart-contract initiated hooks (ie. programmatic order) is not straightforward.

Suggested solution

Write a tutorial that covers generating the app-data for a programmatic order.

Alternatives considered

N/A

Additional context

N/A

Acceptance criteria

• Comprehensive tutorial on pre/post hook creation with programmatic orders
• Cautions around using keccak256("test")
• Bypass checking for keccak256(bytes32(0))