feature request: ics721 handling custom collections

[taitruong]

I was trying transferring a Juno NFT to Stargaze and got this error:
submessages: Error parsing into type cw721::query::ContractInfoResponse: unknown field minter, expected nameorsymbol: execute wasm contract failed [CosmWasm/wasmd@v0.45.0/x/wasm/keeper/keeper.go:395]

Reason is ics721 uses standard cw721, expecting ContractInfoResponse which should only contain name and symbol. But Juno collection has more than that.

command: junod query wasm contract-state smart juno1kpsy0mh58fzrl973ndvppujs9ea5xe9wggjhhg07c42l0yqk5n7st5800h '{"contract_info": {}}'

output:

{
  "data": {
    "name": "Atlas",
    "symbol": "ATL",
    "minter": "juno1xw99es9dwshk4hak3g9hajkppqu4lwnahzs0lkyd6zq7amj23pjqd7pnte",
    "royalty_bps": [
      250,
      250
    ],
    "royalty_addrs": [
      "juno1u8sql7kmx5pget7tavwlz6hhe3mxqn0h8yqr2xx288mk5g4xy58qd32as2",
      "juno1hcldlknu2mn3exckkg75tyzjnderl95zyjte2wl495z9jla0rmdqegxlxx"
    ],
    "second_admin": "juno1u8sql7kmx5pget7tavwlz6hhe3mxqn0h8yqr2xx288mk5g4xy58qd32as2"
  }
}

Solution: instead of using restrictive cw_serde, we can use serde for being more lenient and ignore all unknown fields.