[React] Add useful UI helper components (e.g. PrimaryDomainOrAddress)

[wottpal]

A set of useful helper components for the UI could further increase the value of resolver-react. E.g. these could be:

• PrimaryDomainOrAddress component that resolves a given address to its primary domain but could fall back to a truncated address if none was found.
• AddressOrDomainInput input component (maybe even compatible with react-hook-form) that automatically resolves domains (if entered) but also falls back to entered plain addresses.
• …