Specify content-MD5 when generating presigned URL for uploading object

[hardikSinghBehl]

Type: Feature

Is your feature request related to a problem? Please describe.
When generating a presigned URL for uploading an object, two headers of contentMD5 and contentLength are recommended to be added to avoid phishing attacks and improve overall security.

The ObjectMetadata class allows me to specify the contentLength, but not contentMD5.

Describe the solution you'd like
The ability to configure the contentMD5 hash when generating a PUT presigned URL, like below:

final var metadata = ObjectMetadata.builder().contentLength(length).contentMD5(contentMD5).build();
return s3Template.createSignedPutURL(bucketName, objectKey, urlValidity, metadata, null);

Describe alternatives you've considered

Currently, I used the S3Client class directly instead of S3Template.

Additional context
Can raise a PR for this!

[maciejwalkowiak]

@hardikSinghBehl sounds good! If you're still interested, please submit a PR!

[hardikSinghBehl]

I've raised a PR for this issue @maciejwalkowiak. It's ready to be reviewed!