New feature: address tags from Kleros Curate

To better inform the users about what contract they are interacting with, it is helpful to retrieve address tags provided by the Kleros decentralized tag registry. These tags can be displayed in the user interface down the road.

More information about the service can be found here.
https://blog.kleros.io/the-kleros-decentralized-tag-registry-a-proof-of-concept-for-securing-web3/

@hboon @gmkung