Name files for what they export, and move the session files into session/

test/message-class.test.ts

@@ -2,14 +2,14 @@ import assert from 'node:assert/strict';
 import test, { describe } from 'node:test';
 import type { PduObjectInput } from '../src/codec/pdu.ts';
 import type { SendSmsDeps } from '../src/messages/submit.ts';
-import type { Session } from '../src/session.ts';
-import type { Sms } from '../src/sms.ts';
+import type { Session } from '../src/session/session.ts';
+import type { Sms } from '../src/session/sms.ts';
 import type { TestContext } from 'node:test';
 import { bindToSmsc, dummySmsc } from './dummy-smsc.ts';
 import { client } from '../src/client/client.ts';
 import { closeAfter } from './teardown.ts';
 import { messageClassOf } from '../src/codec/encodings.ts';
-import { paramNumber } from '../src/codec/field-types.ts';
+import { paramNumber } from '../src/codec/types.ts';
 import { pduToObj } from '../src/codec/pdu.ts';
 import { server } from '../src/server/server.ts';
 import { silentLog } from '../src/log.ts';