[net] Move ConnectionType to its own file

src/net.cpp

@@ -576,26 +576,6 @@ void CConnman::AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNet
     }
 }
 
-std::string ConnectionTypeAsString(ConnectionType conn_type)
-{
-    switch (conn_type) {
-    case ConnectionType::INBOUND:
-        return "inbound";
-    case ConnectionType::MANUAL:
-        return "manual";
-    case ConnectionType::FEELER:
-        return "feeler";
-    case ConnectionType::OUTBOUND_FULL_RELAY:
-        return "outbound-full-relay";
-    case ConnectionType::BLOCK_RELAY:
-        return "block-relay-only";
-    case ConnectionType::ADDR_FETCH:
-        return "addr-fetch";
-    } // no default case, so the compiler can warn about missing cases
-
-    assert(false);
-}
-
 CService CNode::GetAddrLocal() const
 {
     AssertLockNotHeld(m_addr_local_mutex);