Add option to disable s3 chunked uploads

[adam-fowler]

Some S3 like services don't support s3 signed chunked uploads. See soto-project/soto#542

[codecov]

Codecov Report

Merging #466 (438e52a) into main (1f5878c) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #466      +/-   ##
==========================================
+ Coverage   75.69%   75.75%   +0.05%     
==========================================
  Files          67       67              
  Lines        5426     5427       +1     
==========================================
+ Hits         4107     4111       +4     
+ Misses       1319     1316       -3     

Impacted Files	Coverage Δ
Sources/SotoCore/AWSServiceConfig.swift	97.56% <ø> (ø)
Sources/SotoCore/AWSClient.swift	89.36% <100.00%> (ø)
Sources/SotoCore/Message/AWSRequest.swift	92.38% <100.00%> (+1.42%)	⬆️
Sources/SotoTestUtils/TestUtils.swift	86.79% <100.00%> (+0.25%)	⬆️
...toCore/Credential/CredentialProviderSelector.swift	93.33% <0.00%> (-6.67%)	⬇️
Sources/SotoSignerV4/signer.swift	91.48% <0.00%> (+0.42%)	⬆️

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