Add IBC denoms to assetlist.json

[ertemann]

I propose allowing for addition of a new category inside asset_list.json named ibc_assets which displays the information for all available IBC coins including their channels, IBC denoms and exponent.

A draft for such a json is shown below. Please provide feedback on the structure and naming convention.

{
    "$schema": "../assetlist.schema.json",
    "chain_name": "cosmoshub",
    "assets": [
      {
        "description": "The native staking and governance token of the Cosmos Hub.",
        "denom_units": [
          {
            "denom": "uatom",
            "exponent": 0
          },
          {
            "denom": "atom",
            "exponent": 6
          }
        ],
        "base": "uatom",
        "name": "Cosmos Hub Atom",
        "display": "atom",
        "symbol": "ATOM",
        "logo_URIs": {
          "png": "https://raw.githubusercontent.com/cosmos/chain-registry/master/cosmoshub/images/atom.png",
          "svg": "https://raw.githubusercontent.com/cosmos/chain-registry/master/cosmoshub/images/atom.svg"
        },
        "coingecko_id": "cosmos"
      }
    ]
	"ibc_assets": [
      {
		"chain_name": "Secret Network",
		"chain_id": "Secret-4",
		"bech32_prefix": "secret",
		"channel_native": "channel-235",
		"channel_external": "channel-0",
		"token_name": "SCRT",
        "ibc_denom": "ibc/F2F4547027DED5928A950CCA9A4DC8199FAB7DA7C2E8630EE78F10D341573D1E",
		"decimals": 6,
        "native_denom": "uscrt",
        "logo_URIs": {
          "png": "https://raw.githubusercontent.com/cosmos/chain-registry/master/secretnetwork/images/scrt.svg",
          "svg": "https://raw.githubusercontent.com/cosmos/chain-registry/master/secretnetwork/images/scrt.png"
        },
        "coingecko_id": "secret"
      }
    ]
  }

[JeremyParish69]

Just saw this. Please see this proposed solution to add an asset type 'ics20' https://github.com/cosmos/chain-registry/pull/1538