Support AWS S3 Server-Side Encryption

[MiLk]

What did you implement:

Support AWS S3 Server-Side Encryption
https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingServerSideEncryption.html

How did you implement it:

Adding a new -aws-s3-server-side-encryption option which can be used to set the SSE method.

How can we verify it:

Publish reports to S3 with -aws-s3-server-side-encryption=AES256.
They should have the Encryption property set to AES256.

Todos:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[kotakanbe]

@MiLk Thanks.
Would you please update the document?

https://vuls.io/docs/en/usage-report.html
https://github.com/vulsdoc/vuls/blob/master/docs/usage-report.md

[MiLk]

Done in vulsdoc/vuls#12

[kotakanbe]

@MiLk Many thanks :)