chore(codegen): use function supplier in RuntimeClientPlugin

[trivikr]

Issue

Refs: smithy-lang/smithy-typescript#353

Description

uses function supplier in RuntimeClientPlugin instead of static function parameters.

Testing

Verified that yarn generate-clients did not update the RuntimeClientPlugin functions in clients.

Additional context

Refs: smithy-lang/smithy-typescript#352

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@cec0692). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 7b89099 differs from pull request most recent head ca062d4. Consider uploading reports for the commit ca062d4 to get more accurate results

@@           Coverage Diff           @@
##             main    #2470   +/-   ##
=======================================
  Coverage        ?   59.54%           
=======================================
  Files           ?      493           
  Lines           ?    26357           
  Branches        ?     6261           
=======================================
  Hits            ?    15695           
  Misses          ?    10662           
  Partials        ?        0           

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[github-actions]

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