Add C API

src/Connection.zig

@@ -12,6 +12,10 @@ pub fn init(socket: RawSocket, headers: EthIpUdp, connection: SaprusMessage) Con
     };
 }
 
+pub fn deinit(self: *Connection) void {
+    self.socket.deinit();
+}
+
 pub fn next(self: Connection, io: Io, buf: []u8) ![]const u8 {
     _ = io;
     log.debug("Awaiting connection message", .{});