refac: better storage integrity handling

[Supremesource]

In src/lib where we store majority of our blockchain's storages, we have all types separated, making code harder to manage. This can cause storage integrity problems. Values like min_burn and max_burn (and many others, follow the same logic) should be together in a struct. Such that the minimum can not be larger than the maximum.

[Supremesource]

are we done here @devwckd ?

[devwckd]

I've moved the burn related params but there's still room for improvement that I'll be tackling asap.