feat(coin): allow IBC denoms

[tbruyelle]

Required for #4655

This PR updates the regexp used to validate a coin denom to accept IBC denoms.

IBC denoms format is:

"ibc/" + hash(trace + "/" + baseDenom)

(example : ibc/542B346608DE032752AF0B21D165190090CD3194F6D177CF35025E39596ABC16)

Where trace represents the path used by the initial token. Each trace can be composed of one to many hops, and a hop format is portID/clientID (example : transfer/07-tendermint-2).

[Gno2D2]

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[tbruyelle]

Blocking, because I need more time to review this one. We planned to use realm/xxx for realms rather than ibc/xxx. If IBC is managed solely through contracts without any additional privileges then the token couldn’t have an ibc/ prefix.

Yes I noticed that problem and I need to clarify how important this ibc/ prefix is.

[tbruyelle]

~~In order to mint/burn IBC tokens, denom format like /gno.land/r/aib/ibc/apps/transfer:ibc/CAEF9CA8CE6C302D73A831A49E34E59149D3A9AD96CCEBDFBF62F6D5710D92D8 must be allowed.~~

~~This commit 1b295f3 removes the denom format check in Banker.Issue/RemoveCoins~~

EDIT: Reverted here e4dc952 due to the fact that std.Coin doesnt validate denom prefixed with realm path. In return we quick fix the banker so the gno.land/r/aib/ibc/apps/transfer is allowed to issue/remove coins with the ibc/ prefix (no realm prefix).