Extend supply permissions

[fedekunze]

Summary

The current permission logic on the supply is rigid. Extend it to allow users to define multiple custom permissions for a ModuleAccount

Problem Definition

As part of #4255, @alexanderbez suggested extending the current rigid permission logic to allow modules to register multiple permissions with their own functions:

I foresee the ability to register arbitrary permissionS with arbitrary function calls for each permission (e.g. burn coins)

Proposal

• Change ModuleAccount Permission and extend it to have multiple Permissions as []string.
• Register a map to the supply keeper with name as Key and PermissionsAddress as value.

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[alexanderbez]

Yes, precisely. What I had in mind is the following:

The supply keeper takes a map[string][]string which maps module account names to a set of permissions. Each name is also mapped to an underlying address (I think this is already the case?).

Furthermore, the supply keeper right now has MintCoins and BurnCoins. We should think of ways we can make it easier to extend this functionality by registering new "methods" with their corresponding permission(s).

[fedekunze]

closed via #4679