chore(clients): support cross-region-copying in DocDB and Neptune

[trivikr]

Issue

Internal JS-2351

Description

supports cross-region-copying in DocDB and Neptune

Testing

Verified that generated code adds middleware for operations in DocDB and Neptune

Additional context

The PR would be made ready, and base branch would be changed to master after #1984 is merged.

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[AllanZhengYP]

It looks good to me.

[codecov-io]

Codecov Report

Merging #1985 (51f2eed) into master (f2a47e8) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1985      +/-   ##
==========================================
+ Coverage   79.30%   79.34%   +0.04%     
==========================================
  Files         368      368              
  Lines       15132    15171      +39     
  Branches     3222     3242      +20     
==========================================
+ Hits        12001    12038      +37     
- Misses       3131     3133       +2     

Impacted Files	Coverage Δ
packages/util-waiter/src/utils/validate.ts	81.81% <0.00%> (-18.19%)	⬇️
lib/storage/src/data-chunk/readable-helper.ts	86.84% <0.00%> (-5.47%)	⬇️
packages/util-dynamodb/src/convertToAttr.ts	98.71% <0.00%> (-1.29%)	⬇️
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)
protocol_tests/aws-query/endpoints.ts	81.48% <0.00%> (ø)
packages/util-dynamodb/src/marshall.ts	100.00% <0.00%> (ø)
... and 49 more

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 676975b
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[github-actions]

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