While applying gossip info from RGS-server, number of harmless
errors might arise which should be ignored. E.g. client should not
fail if there is a duplicate gossip for same channel or duplicate
update.
While `rapid-gossip-sync` recently gained a `no-std` feature, it
didn't actually work, as there were still dangling references to
`std` and prelude assumptions. This makes `rapid-gossip-sync`
build (and test) properly in `no-std`.
Previously the `error` and `processing` modules have been `pub`, leading
to them being included in the docs, altough (almost) empty.
Instead, we now `pub use` the `GraphSyncError` directly, cleaning up the
docs.
P2PGossipSync logs before delegating to NetworkGraph in its
EventHandler. In order to share this handling with RapidGossipSync,
NetworkGraph needs to take a logger so that it can implement
EventHandler instead.
Create a wrapper struct for rapid gossip sync that can be passed to
BackgroundProcessor's start method, allowing it to only start pruning
the network graph upon rapid gossip sync's completion.
