Enable IBC Transfer

[youngjoon-lee]

Background

The IBC Transfer was already enabled on Mainnet/Testnet/Devnet because we've turned on the send_enabled/receive_enabled options in the genesis.json.

But, the IBC Transfer won't work until we upgrade cosmos-sdk to v0.42.9: #224
Also, we should learn how to use https://github.com/cosmos/relayer for the IBC Transfer.

Goal

Test the IBC Transfer with the following components:

• The latest master of the panacea-core (which uses the cosmos-sdk v0.42.9)
• Cosmos Hub (Gaia) Localnet
• Cosmos Relayer

We will probably get some errors if something isn't configured well. Then, research how to configure it well.

Acceptance Criteria

• We can transfer MED coins to the Cosmos Hub Localnet.
• We know how to set up the relayer on production.

[youngjoon-lee]

We've succeeded in transferring MED coins to the Gaia localnet through IBC.
That is, IBC works on our Mainnet only if we upgrade the cosmos-sdk to v0.42.9 (by the issue #224).

[youngjoon-lee]

Plus, we need to take a deep look at how IBC and the relayer work in order to set up our infra properly (even though the relayer may be operated by other players).

So, let's put our research progress here and wrap them up as a document in the end if necessary.

[youngjoon-lee]

done