Feat: add methods to retrieve liana active rules

[mr3wi]

This will help to handle rule based operation.
eg: The join reward notice $notice_join_points display is normally based on the register rule, but there is no check if the rule is active or not. Which mean the notice display no matter the register rule active status.

[dlionel]

1. I don't understand why you want to do that.
2. This is probably a bad idea.

[mr3wi]

1. I don't understand why you want to do that.
2. This is probably a bad idea.

This:

This will help to handle rule based operation. eg: The join reward notice $notice_join_points display is normally based on the register rule, but there is no check if the rule is active or not. Which mean the notice display no matter the register rule active status.