deprecate(api): Deprecated `net.admin` related APIs

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This PR deprecates several APIs (and their implementations) related to the old networking.

Description of the solution adopted: After the modifications in #5318, several interfaces and classes are not more needed. This PR deprecates the following classes:

ConnectionInfo
EthernetMonitorService
NetInterfaceAddedEvent
NetInterfaceRemovedEvent
NetInterfaceStatusChangedEvent
NetworkAdminService
DnsMonitorService
CellularModem
ModemCdmaServiceProvider
ModemManagerService
ModemMonitorListener
ModemMonitorService
ModemPdpContext
ModemPdpContextType
RoutingAgentService
WifiAccessPointAddedEvent
WifiAccessPointRemovedEvent
WifiClientMonitorListener
WifiClientMonitorService
WifiHotspotInfo

eclipse-kura / kura

deprecate(api): Deprecated `net.admin` related APIs #5320