fix(middleware-sdk-s3): missing dependency with esbuild

[AllanZhengYP]

Issue

Resolves #2806

Description

esbuild will try to bundle the optional dependency @aws-sdk/signature-v4-crt and will throw if the dependency is not installed. Unlike Webpack, there's no good way to suppress it with magical comments.

One way to solve this is to wrap the await import() with try...catch, because esBuild supresses this error explicitly. However, in generated code the import is wrapped by tslib import helper. I didn't remove the import helper because it may break the ES6 class polyfill provided by import helper. Instead, we use the Node.js require() here because:

1. Crt package doesn't work for any bundlers now anyway
2. require() won't be analyzed by bundler, so @aws-sdk/signature-v4-crt is not required

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[codecov-commenter]

Codecov Report

Merging #2814 (fb7865f) into main (a7f843a) will increase coverage by 0.00%.
The diff coverage is 80.00%.

@@           Coverage Diff           @@
##             main    #2814   +/-   ##
=======================================
  Coverage   60.41%   60.41%           
=======================================
  Files         554      554           
  Lines       28883    28885    +2     
  Branches     7076     7072    -4     
=======================================
+ Hits        17450    17452    +2     
  Misses      11433    11433           

Impacted Files	Coverage Δ
packages/middleware-sdk-s3/src/S3SignatureV4.ts	88.88% <80.00%> (+0.88%)	⬆️

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[github-actions]

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