chore: use destructuring in xml deserializeMap

[trivikr]

Issue #, if available:
N/A

Description of changes:
use destructuring in xml deserializeMap

• Before

const deserializeAws_queryDomainNameMap = (
  output: any,
  context: __SerdeContext
): { [key: string]: string } => {
  return output.reduce((acc: any, pair: any) => {
    acc[pair["key"]] = pair["value"];
    return acc;
  }, {});
};

• After

const deserializeAws_queryDomainNameMap = (
  output: any,
  context: __SerdeContext
): { [key: string]: string } => {
  return output.reduce(
    (acc: any, pair: any) => ({
      ...acc,
      [pair["key"]]: pair["value"]
    }),
    {}
  );
};

Verified by running the following in browser JavaScript console:

const obj = [{ key: "one", value: "1" }];

obj.reduce((acc, pair) => {
  acc[pair["key"]] = pair["value"];
  return acc;
}, {});

obj.reduce((acc, pair) => ({ ...acc, [pair["key"]]: pair["value"] }), {});

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: da3c5ac
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[codecov-io]

Codecov Report

Merging #1181 into master will decrease coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1181      +/-   ##
==========================================
- Coverage   73.52%   73.31%   -0.22%     
==========================================
  Files         285      285              
  Lines       12497    12391     -106     
  Branches     2892     2892              
==========================================
- Hits         9189     9085     -104     
+ Misses       3308     3306       -2     

Impacted Files	Coverage Δ
protocol_tests/aws-json/protocols/Aws_json1_1.ts	66.66% <0.00%> (-2.07%)	⬇️
...ol_tests/aws-restjson/protocols/Aws_restJson1_1.ts	62.15% <0.00%> (-1.33%)	⬇️
protocol_tests/aws-query/protocols/Aws_query.ts	68.60% <0.00%> (-0.31%)	⬇️
protocol_tests/aws-ec2/protocols/Aws_ec2.ts	63.56% <0.00%> (-0.26%)	⬇️
...rotocol_tests/aws-restxml/protocols/Aws_restXml.ts	67.25% <0.00%> (-0.07%)	⬇️

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[alexforsyth]

LGTM, minor formatting comments

[github-actions]

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