feat: public contracts for update progress, DNS forwards and OSPF (4.17.0)

An application followed a firewall's upgrade, edited its resolver's
forwards and read its OSPF state through the driver's private REST
helpers (NetOrk/netork#1113). Declared contracts, neutral shapes:

- UpdateMixin.get_update_progress() -> UpdateProgressDict {state, log}
  for an update apply_updates only starts.
- DnsForwardMixin: get_dns_forwards(), set_dns_forward(domain, server,
  port), remove_dns_forward(domain); the driver applies.
- OspfMixin.get_ospf() -> OspfDict {router_id, areas, interfaces}; the
  routing daemon's format is the driver's to translate.

All declared only.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-device-types"
-version = "4.16.0"
+version = "4.17.0"
 description = "Abstract device-type base classes for NAPALM drivers"
 readme = "README.md"
 requires-python = ">=3.10"