`wasmd query wasm contract-state all --DECODE` flag

Can we have query to dump all state and decode it?

No I need to write some bash/jq/xxd/base64 script loop or smart queries:
```
wasmd query wasm contract-state all $CONTRACT $NODE --output "json" | jq -r '.models[0].key' | xxd -r -ps
wasmd query wasm contract-state all $CONTRACT $NODE --output "json" | jq -r '.models[0].value' | base64 -d
```

So in my cases I just want dump state of contract and read it in my dev/debug loop, but decoded

Is this worth to add? My be such tools exists and I miss it.

Start at the `wasmd query wasm contract-state all` command and inspect the JSON `models` key and value output shown in the issue examples. The change is done when a `--DECODE` mode can dump all contract state with decoded keys and values, while existing query output remains available; locate the command's tests and run them.

Written by the indexing model from the issue text.