TODO: ADD utils to convert Each type to dex/type (string to denom).

ParseAddAssetMetadataProposalJSON reads and parses an AddAssetMetadataProposalJSON from a file.

ParseRegisterPairsTxJSON reads and parses a RegisterPairsTxJSON from a file.

ParseUpdateTickSizeTxJSON reads and parses a UpdateTickSizeTxJSON from a file.