fix: update updated types

[AllanZhengYP]

• Use HttpRequest interface instread of class when implementation is not necessary
• Make request serializer async just like response deserializer. This makes the serde symmetric

Issue #, if available:

Description of changes:

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Codecov Report

Merging #474 into smithy-codegen will decrease coverage by 0.56%.
The diff coverage is 90.32%.

@@                Coverage Diff                @@
##           smithy-codegen    #474      +/-   ##
=================================================
- Coverage           95.17%   94.6%   -0.57%     
=================================================
  Files                  72      68       -4     
  Lines                1389    1280     -109     
  Branches              272     254      -18     
=================================================
- Hits                 1322    1211     -111     
- Misses                 67      69       +2

Impacted Files	Coverage Δ
packages/signature-v4/src/getCanonicalHeaders.ts	100% <ø> (ø)	⬆️
packages/signature-v4/src/getPayloadHash.ts	100% <ø> (ø)	⬆️
packages/signature-v4/src/constants.ts	100% <100%> (ø)	⬆️
packages/signature-v4/src/suite.fixture.ts	100% <100%> (ø)	⬆️
packages/signature-v4/src/cloneRequest.ts	100% <100%> (ø)	⬆️
packages/signature-v4/src/SignatureV4.ts	100% <100%> (ø)	⬆️
...ckages/node-http-handler/src/write-request-body.ts	71.42% <100%> (ø)	⬆️
packages/node-http-handler/src/server.mock.ts	76.66% <100%> (+2.47%)	⬆️
packages/signature-v4/src/getCanonicalQuery.ts	100% <100%> (ø)	⬆️
packages/signature-v4/src/moveHeadersToQuery.ts	84.61% <66.66%> (-15.39%)	⬇️
... and 7 more

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