chore(mint): update mint calculation aglo to calculate per block

[PaddyMc]

Description

Issue 1

The current minting algorithm is minting nothing the for the first year as

int(math.Floor(float64(ctx.BlockHeight()) / float64(blocksPerYear))) == 0

The fix is just checking if we're in year 1 or not

Issue 2

After fixing Issue 1, the mint algo was minting the full inflation rewards every block as

mintedCoin := sdk.NewCoin(params.MintDenom, sdk.NewInt(inflationAmount))

The fix is (inflation amount / number of blocks per year)

How to test

• make start-dev

First, get the validator operation address:

• elestod query staking validators --output json | jq '.validators[].operator_address'
• elestovaloper1kqnueqfsat86kkjw0cjzn9lk7e2t4r0aumnmj9

At each height

• elestod query bank total => will increase by 5 each block

{
  "supply": [
    {
      "denom": "stake",
      "amount": "200000535"
    }
  ],
}

{
  "supply": [
    {
      "denom": "stake",
      "amount": "200000540"
    }
  ],

• elestod query distribution community-pool --output json | jq => will increase by 0.1 each block

{
  "pool": [
    {
      "denom": "stake",
      "amount": "7.000000000000000000"
    }
  ]
}

{
  "pool": [
    {
      "denom": "stake",
      "amount": "7.100000000000000000"
    }
  ]
}

• elestod query distribution validator-outstanding-rewards elestovaloper1kqnueqfsat86kkjw0cjzn9lk7e2t4r0aumnmj9 --output json | jq => will increase by 4.9 each block

{
  "rewards": [
    {
      "denom": "stake",
      "amount": "646.800000000000000000"
    }
  ]
}

{
  "rewards": [
    {
      "denom": "stake",
      "amount": "651.700000000000000000"
    }
  ]
}

[gsora]

Hey! Thanks for the PR.

As I mentioned in a comment in #104, we're already dealing with microtokens, and the numerical outcome in terms of supply matches the simulations we ran.

But! We actually introduced a bug when dealing with year 0, so thank you for letting us know! It's now fixed in #104.