Refactor network/consensus versioning

[mrBliss]

Fixes #2309.

Previously, we had a list of supported BlockNodeToNodeVersions and a method
to translate them to a NodeToNodeVersion. This meant that there were two
layers of "support": (1) include the version in BlockNodeToNodeVersion
and (2) return a non-error for it in the translation function.

Replace these methods by a map from NodeToNodeVersion to
BlockNodeToNodeVersion. Similarly for NodeToClient. An important insight
is that not each network version requires a consensus-side block version. For
example, enabling the LocalStateQuery NodeToClient protocol requires a new
network version, but no block version, as the serialisation format doesn't
change. A new block version is only needed when the serialisation changes, so
not when protocols get added/removed or the protocol messages are
added/removed.

This means we don't need separate Byron (nor Cardano) versions for
NodeToClientV_2, as the serialisation format didn't change, so remove these
redundant versions and map NodeToClientV_2 to ByronNodeToClientVersion1.

The mostRecentSupportedNodeToNode method was only used for the ThreadNet
tests to make sure we were testing the most recent version. Remove this method
in favour of randomly picking a supported version in the tests. The
Test.ThreadNet.Util.NodeToNodeVersion was added to aid in picking a version.

• Rewrite foldMapVersions and combineVersions to work for any Foldable
  instead of a NonEmpty, as we now use a Map instead of a NonEmpty for
  the supported versions.

• Rewrite Cardano.Client.Subscription to take a CodecConfig +
  NetworkMagic instead of an entire TopLevelConfig. Producing a
  TopLevelConfig is a lot of work for clients. The whole point of
  introducing the CodecConfig was to make it easier for clients.

[edsko]

Good to clarify this logic, much cleaner.

[mrBliss]

bors merge

[iohk-bors]

Build succeeded

• buildkite/ouroboros-network
• ci/hydra:Cardano:ouroboros-network:required