feat: move top-level serde functions into command file

[srchase]

moves top-level command serde functions into command file.

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[codecov-io]

Codecov Report

Merging #419 into smithy-codegen will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           smithy-codegen    #419   +/-   ##
==============================================
  Coverage            96.5%   96.5%           
==============================================
  Files                  72      72           
  Lines                1231    1231           
  Branches              224     224           
==============================================
  Hits                 1188    1188           
  Misses                 43      43

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[AllanZhengYP]

Looks good to me.

[lock]

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