Change ChecksumCalculatingAsyncRequestBody to look for contentLength …

[zoewangg]

…from the wrapped body first to preserve behavior prior to 2.30.0

aws-sdk-java-v2/core/sdk-core/src/main/java/software/amazon/awssdk/core/internal/async/ChecksumCalculatingAsyncRequestBody.java

Lines 64 to 65 in e1a011b

	this.totalBytes = wrapped.contentLength()
	.orElseThrow(() -> new UnsupportedOperationException("Content length must be supplied."));

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• New feature (non-breaking change which adds functionality)

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