Should network also contain "getHostName"?

I was surprised that in Haskell, the only way to (portably) get the host name is via [the hostname](https://hackage.haskell.org/package/hostname-1.0) which has not been updated in 16 years and has no link to its source repository.

Should this very basic functionality not be in `network`, and thus maintained?

Start by reviewing the network package and the linked hostname package to compare their scope and maintenance status. Determine whether portable getHostName functionality belongs in network and define the expected API and platform coverage; the issue is complete when that design decision and implementation scope are settled.

Written by the indexing model from the issue text.