feat(examples): add subscriptions package

[MikaelVallenet]

a package that handle subscriptions either with native coins or grc20 coins. a public API with a way to create service where users can subscribe and top up their account. Services owners can check the status of a user subscription to give access or not to a service.

The coins part is from payrolls realm available here: https://github.com/gnolang/gno/pull/3432 I added unit test for the coins handling part that is the most "critical" one.

⚠️ This realm is set to private to allow upgrade without proxy pattern and is meant to be an example of what is possible not developed in a production goal, for now at least

[Gno2D2]

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[Davphla]

Little proposition: Use ID instead of subscription name to subscribe to a service