Read a delivery receipt's body as the octets that arrived (#81)

* Regression tests for a receipt body read under a data_coding it is not written in

* Read a delivery receipt's body as the octets that arrived, not by its data_coding

* Assert SMPPSim's UCS2 receipt body parses like every other segment's

* Record the receipt-body defect as fixed

* Retain a multipart segment's octets once, not twice

* Sort the new type import into its file's order

src/pdu-transport.ts

@@ -3,7 +3,8 @@ import type { SmppLog } from './log.ts';
 import type { Socket } from 'node:net';
 import type { VoidResult } from './result.ts';
 import { PduFramer } from './pdu-framer.ts';
-import { PduRefusedError, pduToObj } from './pdu.ts';
+import { PduRefusedError } from './pdu-refusal.ts';
+import { pduToObj } from './pdu.ts';
 
 export type PduTransportOptions = {
 	log: SmppLog;