Reduce inflation due to CIP-29

[rootulp]

Context

https://github.com/celestiaorg/CIPs/blob/main/cips/cip-029.md

Problem

supply/internal/cumulative_inflation.go

Lines 3 to 19 in 36b196b

	// cumulativeInflation returns the total amount of utia that will be minted due to inflation.
	func cumulativeInflation(daysSinceGenesis int64) int64 {
	if daysSinceGenesis == 0 {
	return 0
	}
	return cumulativeInflation(daysSinceGenesis-1) + dailyInflationForDay(daysSinceGenesis-1)
	}
	// dailyInflationForDay returns the amount of utia that will be minted per day due to inflation.
	func dailyInflationForDay(daysSinceGenesis int64) int64 {
	if daysSinceGenesis == 0 {
	return dailyInflationForYear(0)
	}
	yearsSinceGenesis := daysSinceGenesis / 365
	return dailyInflationForYear(yearsSinceGenesis)
	}

does not account for the reduction in inflation

Proposal

1. Modify the code in this repo to account for CIP-29 which reduces the inflation and disinflation. The inflation reduction will take effect at the v4 activation height so we need to calculate inflation with the previous constants until that date and then use the new constants after that date.
2. Add unit tests