Eliminate lambda indirection overhead in DynamoDB Enhanced Client #1554

Job	Run time
check-s3-related-changes	56s
s3-regression-tests-upload-sync	4m 21s
s3-regression-tests-control-plane	2m 20s
s3-regression-tests-upload-async	3m 53s
s3-regression-tests-upload-crt	3m 51s
s3-regression-tests-upload-multi	2m 51s
s3-regression-tests-download	2m 21s
	20m 33s

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