feat(util-dynamodb): marshall JavaScript Maps

[trivikr]

Issue

Fixes: #2008

Description

adds support to marshall JavaScript Map into DynamoDB Attribute Map

Testing

Unit tests

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[codecov-io]

Codecov Report

Merging #2010 (6161f05) into master (f2a47e8) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2010      +/-   ##
==========================================
+ Coverage   79.30%   79.37%   +0.06%     
==========================================
  Files         368      368              
  Lines       15132    15203      +71     
  Branches     3222     3255      +33     
==========================================
+ Hits        12001    12067      +66     
- Misses       3131     3136       +5     

Impacted Files	Coverage Δ
packages/util-waiter/src/utils/validate.ts	81.81% <0.00%> (-18.19%)	⬇️
...process-arnables-plugin/update-arnables-request.ts	91.30% <0.00%> (-8.70%)	⬇️
lib/storage/src/data-chunk/readable-helper.ts	86.84% <0.00%> (-5.47%)	⬇️
...s/middleware-bucket-endpoint/src/bucketHostname.ts	98.27% <0.00%> (-1.73%)	⬇️
packages/util-dynamodb/src/convertToAttr.ts	98.94% <0.00%> (-1.06%)	⬇️
packages/util-waiter/src/poller.ts	100.00% <0.00%> (ø)
packages/util-waiter/src/waiter.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/endpoints.ts	81.48% <0.00%> (ø)
protocol_tests/aws-json/endpoints.ts	81.48% <0.00%> (ø)
packages/middleware-ssec/src/index.ts	82.60% <0.00%> (ø)
... and 53 more

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 6161f05
• Result: SUCCEEDED
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[alexforsyth]

LGTM

[github-actions]

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