SDK simulation doesn't support custom keys

[fedekunze]

Summary of Bug

The sdk sims have the secp256k1 key hardcoded for generating random accounts, preventing from running sims on other chains which use custom keys.

// types/simulation/account.go

// RandomAccounts generates n random accounts
func RandomAccounts(r *rand.Rand, n int) []Account {
	accs := make([]Account, n)

	for i := 0; i < n; i++ {
		// don't need that much entropy for simulation
		privkeySeed := make([]byte, 15)
		r.Read(privkeySeed)

		accs[i].PrivKey = secp256k1.GenPrivKeyFromSecret(privkeySeed)
		accs[i].PubKey = accs[i].PrivKey.PubKey()
		accs[i].Address = sdk.AccAddress(accs[i].PubKey.Address())

		accs[i].ConsKey = ed25519.GenPrivKeyFromSecret(privkeySeed)
	}

	return accs
}

The easy solution I see is to pass in an argument to the SimulateFromSeed that generates a random account:

type RandomAccountFn func(r *rand.Rand, n int) []Account

func SimulateFromSeed(
	tb testing.TB, w io.Writer, app *baseapp.BaseApp,
	appStateFn simulation.AppStateFn, randAccFn simulation.RandomAccountFn,
	ops WeightedOperations,
	blackListedAccs map[string]bool, config simulation.Config,
) (stopEarly bool, exportedParams Params, err error) {

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