Type of request: This is a ...

[ ] bug report
[x] feature request

Detailed description

As a Developer,
I want to be able to simulate BadDigest and InvalidDigest errors,
So that I can test the error handling logic

Expected behavior

https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
BadDigest: The Content-MD5 you specified did not match what we received.
InvalidDigest: The Content-MD5 you specified is not valid.

Actual behavior

localstack returns InvalidDigest when MD5 does not match payload.