Prop 140: Setup Juno IBC Auto-Forwarding

This proposal, if accepted, would establish the bech32 address prefix 'juno' as the IBC Auto-Forwarding prefix for SendToCosmos transactions. Any SendToCosmos transactions whose CosmosReceiver field begins with 'juno1' would automatically be forwarded to juno network over IBC channel channel-8. Failed IBC transactions will result in tokens transferred to the equivalent address on the Gravity Bridge chain, requiring user intervention with the same cosmos private key. When evaluating this proposal the community should be confident that channel-8 is the official channel leading to juno network, and that is the correct prefix for Juno account addresses.