Handle constructing ProviderConfigs for non-Cosmos chains in addChainsFromRegistry

[jtieri]

If non-Cosmos chains will be included in the chain registry then we will need to properly handle constructing the ProviderConfig's for those chains as well inside of the call to addChainsFromRegistry

Currently we do not check what the chain type is and we just pull down the data and construct a CosmosProviderConfig

relayer/cmd/chains.go

Lines 478 to 496 in 4076e7a

	pcfg := &cosmos.CosmosProviderConfig{
	Key: chainConfig.Key,
	ChainName: chainInfo.ChainName,
	ChainID: chainConfig.ChainID,
	RPCAddr: chainConfig.RPCAddr,
	AccountPrefix: chainConfig.AccountPrefix,
	KeyringBackend: chainConfig.KeyringBackend,
	GasAdjustment: chainConfig.GasAdjustment,
	GasPrices: chainConfig.GasPrices,
	Debug: chainConfig.Debug,
	Timeout: chainConfig.Timeout,
	OutputFormat: chainConfig.OutputFormat,
	SignModeStr: chainConfig.SignModeStr,
	}
	prov, err := pcfg.NewProvider(
	a.Log.With(zap.String("provider_type", "cosmos")),
	a.HomePath, a.Debug, chainInfo.ChainName,
	)

[jtieri]

I know we discussed this as a team before but is this even necessary? I forget if the chain registry will be hosting the necessary information for non-cosmos chains.

Ex: Polkadot is a generalized directory that holds information about the Polkadot relay chain but not actually any specific parachain https://github.com/cosmos/chain-registry/blob/master/_non-cosmos/polkadot/assetlist.json

cc @boojamya