Feat: Add Points

[IkigaiLabsETH]

https://docs.stack.so/get-started.html#get-your-api-key

Stack is introducing loyalty points as an onchain primitive, along with simple tools for managing points programs.

Features

Create multiple point systems, each with its own unique ID
Add and subtract points from user balances within a point system
Retrieve point balances and total points within a point system
Perform batch operations to add or subtract points for multiple users simultaneously
Support for managing administrators and external contracts (issuers) within a point system
Set and retrieve metadata (URI) for each point system
Observer pattern to notify external contracts of point balance changes

https://docs.stack.so/chain.html#the-points-protocol