Missing querier for coin metadata

[Thunnini]

https://github.com/cosmos/cosmos-sdk/blob/master/docs/architecture/adr-024-coin-metadata.md

ADR-024 defines the coin metadata that can be used for the wallet to get the information of the denomination to show the asset in the human-readable format.

However, it seems that there is no way to query this metadata from the REST endpoint.