Add AccountNumberStoreKeyPrefix to the x/auth simulation decoder.

[SpicyLemon]

Summary

Add a case for AccountNumberStoreKeyPrefix to the x/auth simulation decoder.

Problem Definition

The NewDecodeStore defined in x/auth/simulation/decoder.go doesn't have an entry for the newly added AccountNumberStoreKeyPrefix. This causes the provenance import/export sims to fail because those entries exist in the store, but cannot be decoded (panic: unexpected key).

Proposal

Add this case to the NewDecodeStore switch:

		case bytes.Equal(kvA.Key[:len(types.AccountNumberStoreKeyPrefix)], types.AccountNumberStoreKeyPrefix):
			var accNumA, accNumB sdktypes.AccAddress
			err := accNumA.Unmarshal(kvA.Value)
			if err != nil {
				panic(err)
			}

			err = accNumB.Unmarshal(kvB.Value)
			if err != nil {
				panic(err)
			}

			return fmt.Sprintf("AccNumA: %s\nAccNumB: %s", accNumA, accNumB)