[WIP]fix(clients-*): update default userAgent

[AllanZhengYP]

Update all the default user agent to comply the metrics standard.

For node.js the default user agent will look like:
aws-sdk-nodejs/3.0.0 linux nodejs/14.3.0 sdk-client/client-s3
browsers:
aws-sdk-js/3.0.0 Gecko Mozilla/5.0 (linux) AppleWebKit/537.36 (KHTML, like Gecko) jsdom/16.2.2 sdk-client/client-s3
react-native:
aws-sdk-js/3.0.0 ReactNative sdk-client/client-s3

/cc @zoewangg

This change also migrate the defaultUserAgent customization to AWS sdk codegen: smithy-lang/smithy-typescript#234

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

[codecov-io]

Codecov Report

Merging #1674 (f9aef09) into master (de75f7e) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #1674    +/-   ##
========================================
  Coverage   79.77%   79.78%            
========================================
  Files         325      331     +6     
  Lines       12087    12587   +500     
  Branches     2553     2678   +125     
========================================
+ Hits         9643    10042   +399     
- Misses       2444     2545   +101     

Impacted Files	Coverage Δ
...tocol_tests/aws-restxml/commands/XmlMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...col_tests/aws-restjson/commands/JsonMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlAttributesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlNamespacesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
... and 130 more

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[AllanZhengYP]

Close it as the design changes. Will put up new PR when the implementation update is done.

[trivikr]

Superceded by #1775

[github-actions]

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