* network-gossip: add metric for number of local messages
* grandpa: fix GossipEngine missing metrics registry parameter
* network-gossip: increase known messages cache size
* network-gossip: fix tests
* grandpa: remove unnecessary clone
Co-authored-by: Max Inden <mail@max-inden.de>
* network-gossip: count registered and expired messages separately
* network-gossip: add comment on known messages cache size
* network-gossip: extend comment with cache size in memory
Co-authored-by: Max Inden <mail@max-inden.de>