[feature] inflation goal

[extraymond]

Info

description:
according to the tokenomics setup of laguna chain, chain need to start from 15% annual inflation until 1.5%, with inflation rate reduced by 1.5% base point annually.

expected results:

• mint new tokens and share the rewards with the validators
• total minted should be 15% - 1.5%*Y annually
• should be configurable to shift from POA to POS