Migrate old dex prefix data

[LCyson]

Describe your changes and provide context

This PR adds a migration handler for the dex prefixes change here: #483. To be noted that here we will simply nuke the old data as this will only be needed on the devnet-2.

Other option is to replace the existing data like the snippet below, but given there are keys with suffix, either getting all pairs from contracts or assuming the contract address length is 62 in bytes is not as safe as nuking the old data on the devnet-2.

	for _, prefixKey := range DexPrefixes {
		store := prefix.NewStore(ctx.KVStore(dexkeeper.GetStoreKey()), []byte(prefixKey))
		iterator := sdk.KVStorePrefixIterator(store, []byte{})

		defer iterator.Close()
		for ; iterator.Valid(); iterator.Next() {
			key := iterator.Key()
			if !bytes.HasPrefix(key, []byte(prefixKey)) {
				panic(fmt.Sprintf("Key %x doesn't has prefix %s\n", key, prefixKey))
			}
			key = bytes.TrimPrefix(key, []byte(prefixKey))

			key = append([]byte(prefixKey), types.AddressKeyPrefix(string(key))...)

			store.Set(key, iterator.Value())
			store.Delete(iterator.Key())
		}
	}

Testing performed to validate your change

• Unit test
• Upgraded the chain locally with the following steps
  • deployed vortex contract to V10
  • placed an order
  • upgraded to V11
  • confirmed the order is nuked and no panic/exception was thrown

[github-actions]

Package	Line Rate	Complexity	Health
github.com/sei-protocol/sei-chain/aclmapping/bank	83%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/dex	100%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/oracle	100%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/staking	82%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/tokenfactory	96%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/utils	0%	0	❌
github.com/sei-protocol/sei-chain/aclmapping/wasm	83%	0	✔
github.com/sei-protocol/sei-chain/app	59%	0	➖
github.com/sei-protocol/sei-chain/app/antedecorators	75%	0	✔
github.com/sei-protocol/sei-chain/oracle/price-feeder/config	85%	0	✔
github.com/sei-protocol/sei-chain/oracle/price-feeder/oracle	73%	0	➖
github.com/sei-protocol/sei-chain/oracle/price-feeder/oracle/provider	48%	0	❌
github.com/sei-protocol/sei-chain/oracle/price-feeder/router/v1	45%	0	❌
github.com/sei-protocol/sei-chain/store/whitelist/cachemulti	100%	0	✔
github.com/sei-protocol/sei-chain/store/whitelist/kv	100%	0	✔
github.com/sei-protocol/sei-chain/store/whitelist/multi	100%	0	✔
github.com/sei-protocol/sei-chain/utils	46%	0	❌
github.com/sei-protocol/sei-chain/utils/datastructures	90%	0	✔
github.com/sei-protocol/sei-chain/x/dex	58%	0	➖
github.com/sei-protocol/sei-chain/x/dex/cache	86%	0	✔
github.com/sei-protocol/sei-chain/x/dex/client/cli/query	23%	0	❌
github.com/sei-protocol/sei-chain/x/dex/contract	53%	0	➖
github.com/sei-protocol/sei-chain/x/dex/exchange	89%	0	✔
github.com/sei-protocol/sei-chain/x/dex/keeper	67%	0	➖
github.com/sei-protocol/sei-chain/x/dex/keeper/abci	29%	0	❌
github.com/sei-protocol/sei-chain/x/dex/keeper/msgserver	77%	0	✔
github.com/sei-protocol/sei-chain/x/dex/keeper/query	82%	0	✔
github.com/sei-protocol/sei-chain/x/dex/migrations	88%	0	✔
github.com/sei-protocol/sei-chain/x/dex/types	1%	0	❌
github.com/sei-protocol/sei-chain/x/dex/types/utils	100%	0	✔
github.com/sei-protocol/sei-chain/x/dex/types/wasm	83%	0	✔
github.com/sei-protocol/sei-chain/x/epoch	11%	0	❌
github.com/sei-protocol/sei-chain/x/epoch/keeper	66%	0	➖
github.com/sei-protocol/sei-chain/x/epoch/types	2%	0	❌
github.com/sei-protocol/sei-chain/x/mint	0%	0	❌
github.com/sei-protocol/sei-chain/x/mint/keeper	75%	0	➖
github.com/sei-protocol/sei-chain/x/mint/simulation	95%	0	✔
github.com/sei-protocol/sei-chain/x/mint/types	2%	0	❌
github.com/sei-protocol/sei-chain/x/nitro/client/cli	45%	0	❌
github.com/sei-protocol/sei-chain/x/nitro/keeper	80%	0	✔
github.com/sei-protocol/sei-chain/x/nitro/replay	63%	0	➖
github.com/sei-protocol/sei-chain/x/oracle	64%	0	➖
github.com/sei-protocol/sei-chain/x/oracle/keeper	82%	0	✔
github.com/sei-protocol/sei-chain/x/oracle/simulation	18%	0	❌
github.com/sei-protocol/sei-chain/x/oracle/types	3%	0	❌
github.com/sei-protocol/sei-chain/x/tokenfactory/keeper	85%	0	✔
github.com/sei-protocol/sei-chain/x/tokenfactory/types	2%	0	❌
Summary	15% (5034 / 33941)	0	❌

[philipsu522]

lgtm, but let's get @codchen 's reviews as well.
in your local test, was vortex contract deployed with data on it (long book, orders...etc.)

[LCyson]

lgtm, but let's get @codchen 's reviews as well. in your local test, was vortex contract deployed with data on it (long book, orders...etc.)

Yes, tested by placing a LONG order and verified that order and also the trading pairs are nuked