Revisit location or existence of NetworkStatus

[romanb]

by @tomaka from #6986 (comment):

NetworkStatus was moved by someone not in the networking team as part of a big PR, and I didn't spot the change.

The entire point of NetworkStatus is to communicate some networking-related information internally between some components without having to depend on sc-network.
Moving it to sc-network entirely defeats this purpose.

It should either be moved back for example to sc-service, or be removed entirely and have everything depend on Arc<NetworkService>.

[kpp]

A little bit of context for this issue:

• NetworkStatus reporting was added to the service in Move the network status reporting to the service #2916
• NetworkStatus moved from service to the network in Allow adding a prefix to the informant #6174

[kpp]

Dependent crates of struct NetworkStatus:

• sc-informant
• sc-network
• sc-service

Cargo trees:

• sc-informant -> sc-network
• sc-service -> (other deps...) -> sc-network

So no wonder the struct is located in sc-network. Placing the struct inside sc-service create cyclic package dependency...