[FR] - Data.Map style module for UTxO

[locallycompact]

In hydra we are using a lot of Data.Map style functions on a custom newtype definition for UTxO.

https://github.com/cardano-scaling/hydra/blob/2943ad0e38e259d41dd547ba58844377ab51a73c/hydra-cardano-api/src/Cardano/Api/UTxO.hs#L55

Could we have a module for the specific UTxO type that is returned from querying via the cardano api that exports filtering and singleton functions. This module would be intended to be imported qualified, similarly to how people import the different types of haskell containers.

import qualified Cardano.Api.UTxO as UTxO

...
x = UTxO.singleton $