fix(middleware-apply-body-checksum): use lowercase content-md5 header

[trivikr]

Issue

Refs: #2644 (comment)

Description

Uses lowercase name for content-md5 header to fix the following protocol test failure:

344 | FAIL protocol_tests/aws-restjson/tests/functional/restjson1.spec.ts (26.65 s)
345 | ● RestJsonHttpChecksumRequired:Request
346 |  
347 | expect(received).toBeDefined()
348 |  
349 | Received: undefined
350 |  
351 | 1918 \|     expect(r.path).toBe("/HttpChecksumRequired");
352 | 1919 \|
353 | > 1920 \|     expect(r.headers["content-md5"]).toBeDefined();
354 | \|                                      ^
355 | 1921 \|     expect(r.headers["content-md5"]).toBe("iB0/3YSo7maijL0IGOgA9g==");
356 | 1922 \|     expect(r.headers["content-type"]).toBeDefined();
357 | 1923 \|     expect(r.headers["content-type"]).toBe("application/json");
358 |  
359 | at Object.<anonymous>.it (tests/functional/restjson1.spec.ts:1920:38)

Testing

Verified that an example command which uses content-md5 header is successfully run

Code

import {
  S3Client,
  CreateBucketCommand,
  GetBucketLifecycleConfigurationCommand,
  PutBucketLifecycleConfigurationCommand,
  waitUntilBucketExists,
} from "../aws-sdk-js-v3/clients/client-s3/dist/cjs/index.js";

const region = "us-west-2";
const Bucket = `test-bucket-${Date.now()}`;
const client = new S3Client({ region });

client.middlewareStack.add(
  (next, context) => async (args) => {
    // Logs content-md5 header for PutBucketLifecycleConfigurationCommand
    console.log(args.request.headers["content-md5"]);
    return next(args);
  },
  {
    step: "finalizeRequest",
    name: "logHeadersMiddleware",
  }
);

const LifecycleConfiguration = {
  Rules: [
    {
      Expiration: { Days: 1 },
      ID: "TestUploads",
      Filter: { Prefix: "test" },
      Status: "Enabled",
    },
  ],
};

await client.send(new CreateBucketCommand({ Bucket }));
await waitUntilBucketExists({ client }, { Bucket });
await client.send(
  new PutBucketLifecycleConfigurationCommand({ Bucket, LifecycleConfiguration })
);
console.log(
  JSON.stringify(
    await client.send(new GetBucketLifecycleConfigurationCommand({ Bucket })),
    null,
    2
  )
);

Output

undefined
undefined
Cjf7B15n+E6KCLpIdWpijw==
undefined
{
  "$metadata": {
    "httpStatusCode": 200,
    "extendedRequestId": "z0rbTBowHwDo98YzHwBKespzJaLQ47t4wz28RFOgpIk0EXMgLPK4fXtFiubE0dny/6QupRsJP4E=",
    "attempts": 1,
    "totalRetryDelay": 0
  },
  "Rules": [
    {
      "Expiration": {
        "Days": 1
      },
      "ID": "TestUploads",
      "Filter": {
        "Prefix": "test"
      },
      "Status": "Enabled"
    }
  ]
}

---

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