chore: define headers while declaring

[trivikr]

Issue #, if available:
Refs: smithy-lang/smithy-typescript#175

Description of changes:
Define headers while declaring

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[aws-sdk-js-automation]

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• CodeBuild project: sdk-staging-test
• Commit ID: b871590
• Result: SUCCEEDED
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[aws-sdk-js-automation]

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• CodeBuild project: sdk-staging-test
• Commit ID: 791dcfa
• Result: SUCCEEDED
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[codecov-io]

Codecov Report

Merging #1134 into master will decrease coverage by 0.43%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1134      +/-   ##
==========================================
- Coverage   73.85%   73.42%   -0.44%     
==========================================
  Files         284      284              
  Lines       13175    12924     -251     
  Branches     3106     3108       +2     
==========================================
- Hits         9731     9490     -241     
+ Misses       3444     3434      -10     

Impacted Files	Coverage Δ
protocol_tests/aws-ec2/protocols/Aws_ec2.ts	63.99% <ø> (-0.95%)	⬇️
protocol_tests/aws-json/protocols/Aws_json1_1.ts	68.80% <ø> (-0.52%)	⬇️
protocol_tests/aws-query/protocols/Aws_query.ts	68.58% <ø> (-0.96%)	⬇️
...ol_tests/aws-restjson/protocols/Aws_restJson1_1.ts	64.40% <ø> (-1.44%)	⬇️
...rotocol_tests/aws-restxml/protocols/Aws_restXml.ts	67.65% <ø> (-1.09%)	⬇️

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 19035b2
• Result: SUCCEEDED
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