feat: replace UpstreamChainFetcher with PeerNetworkInterface

Cargo.toml

@@ -10,7 +10,6 @@ members = [
     "modules/genesis_bootstrapper",         # Genesis bootstrap UTXOs
     "modules/mithril_snapshot_fetcher",     # Mithril snapshot fetcher
     "modules/snapshot_bootstrapper",        # Bootstrap state from a ledger snapshot
-    "modules/upstream_chain_fetcher",       # Upstream chain fetcher
     "modules/peer_network_interface",       # Multi-peer network interface
     "modules/block_unpacker",               # Block to transaction unpacker
     "modules/tx_unpacker",                  # Tx to UTXO unpacker

README.md

@@ -54,7 +54,7 @@ graph TB
 
 ## Modules
 
-- [Upstream Chain Fetcher](modules/upstream_chain_fetcher) -
+- [Peer Network Interface](modules/peer_network_interface) -
   implementation of the Node-to-Node (N2N) client-side (initiator)
   protocol, allowing chain synchronisation and block fetching
 - [Mithril Snapshot Fetcher](modules/mithril_snapshot_fetcher) -

modules/README.md

@@ -3,7 +3,7 @@
 This directory holds microservice modules for a Caryatid framework which
 compose the Acropolis Architecture
 
-* [Upstream Chain Fetcher](upstream_chain_fetcher) -
+* [Peer Network Interface](peer_network_interface) -
   implementation of the Node-to-Node (N2N) client-side (initiator)
   protocol, allowing chain synchronisation and block fetching
 * [Mithril Snapshot Fetcher](mithril_snapshot_fetcher) -

modules/block_unpacker/README.md

@@ -20,8 +20,7 @@ publish-topic = "cardano.txs"
 ## Messages
 
 The block unpacker subscribes for RawBlockMessages on
-`cardano.block.proposed` (see the [Upstream Chain
-Fetcher](../upstream_chain_fetcher) module for details).  It unpacks
+`cardano.block.proposed` (see the [Consensus](../consensus) module for details).  It unpacks
 this into transactions, which it publishes as a single RawTxsMessage
 on `cardano.txs`, containing the block information and an ordered vector of
 raw transaction CBOR.  This ensure the transactions are kept in order.

modules/mithril_snapshot_fetcher/README.md

@@ -9,7 +9,7 @@ a startup event before beginning to allow the
 
 When it has finished it sends a snapshot complete event indicating the
 last block fetched, which is used by the
-[Upstream Chain Fetcher](../upstream_chain_fetcher) to synchronize ongoing 
+[Peer Network Interface](../peer_network_interface) to synchronize ongoing 
 fetches.
 
 ## Configuration