Querier for inflation parameters and block rewards

[zmanian]

It's needed to have querier that gets the state of inflation of the staking token.

Basically these

type Minter struct {
	Inflation        sdk.Dec   // current annual inflation rate
	AnnualProvisions sdk.Dec   // current annual exptected provisions
}

[kevlubkcm]

Would be great if we had the other params too:

type Params struct {
	MintDenom           string  `json:"mint_denom"`            // type of coin to mint
	InflationRateChange sdk.Dec `json:"inflation_rate_change"` // maximum annual change in inflation rate
	InflationMax        sdk.Dec `json:"inflation_max"`         // maximum inflation rate
	InflationMin        sdk.Dec `json:"inflation_min"`         // minimum inflation rate
	GoalBonded          sdk.Dec `json:"goal_bonded"`           // goal of percent bonded atoms
	BlocksPerYear       uint64  `json:"blocks_per_year"`       // expected blocks per year
}

[jackzampolin]

It would also be nice to return some calculated numbers like effective-annual-inflation-for-bonded or similar

[fedekunze]

MintDenom string json:"mint_denom"

hmm that will always be the staking denomination, so not sure if it's redundant with the staking params struct. I agree with the rest tho

[zmanian]

effective annualized yield is inflations * ((self bond/ total bond) + commission * delegator bond/total bond)