Enumeration of node to node protocol versions.

Historical versions:

NodeToNodeV_7
-- ^ Changes:
--
-- * new KeepAlive codec
-- * Enable CardanoNodeToNodeVersion5, i.e., Alonzo
| NodeToNodeV_8
-- ^ Changes:
--
-- * Enable block diffusion pipelining in ChainSync and BlockFetch logic.
| NodeToNodeV_9
-- ^ Changes:
--
-- * Enable CardanoNodeToNodeVersion6, i.e., Babbage
| NodeToNodeV_10
-- ^ Changes:
--
-- * Enable full duplex connections.
| NodeToNodeV_11
-- ^ Changes:
--
-- * Adds a new extra parameter to handshake: PeerSharing
--   This version is needed to support the new  Peer Sharing miniprotocol
--   older versions that are negotiated will appear as not participating
--   in Peer Sharing to newer versions.
-- * Adds query to NodeToClientVersionData.
| NodeToNodeV_12
-- ^ No changes.
--
-- (In the past, this enabled Conway, but the negotiated NodeToNodeVersion
-- no longer en-/disables eras.)
| NodeToNodeV_13
-- ^ Changes:
-- * Removed PeerSharingPrivate constructor
-- * Fixed Codec to disable PeerSharing with buggy versions 11 and 12.
-- * Disable PeerSharing with InitiatorOnly nodes, since they do not run
--   peer sharing server side and can not reply to requests.

Version data for NodeToNode protocol

Beware, encoding an invalid NodeToNodeVersionData (see isValidNtnVersionDataForVersion) for a given version will fail if a future field is set to a value other than its default forwards compatibility one. This way encodeTerm and decodeTerm are only inverses for valid data.

perasSupport field is introduced with NodeToNodeV_16, and thus should be set to PerasUnsupported (and not be serialized) for versions before that.

Determine the local node's Peras support status based on feature flags and version.