Extend bucket policy support

[KirillovDenis]

Currently we expects that Statement.Action and Statement.Resources (in bucket policy) be string array as more general case.

{
    "Version": "2012-10-17",
    "Statement": [{
        "Principal":{
            "AWS":[
                "arn:aws:iam::111122223333:role/JohnDoe"
            ]
        },
        "Effect": "Allow",
        "Action": [
            "s3:PutObjectTagging"
        ],
        "Resource": [
            "arn:aws:s3:::DOC-EXAMPLE-BUCKET/*"
        ],
        "Condition": {
            "ForAnyValue:StringEquals": {
                "s3:RequestObjectTagKeys": [
                    "Owner",
                    "CreationDate"
                ]
            }
        }
    }
  ]
}

But we should support and more particular case:

{
    "Version": "2012-10-17",
    "Id": "PutObjPolicy",
    "Statement": [{
        "Sid": "DenyObjectsThatAreNotSSEKMS",
        "Principal": "*",
        "Effect": "Deny",
        "Action": "s3:PutObject",
        "Resource": "arn:aws:s3:::DOC-EXAMPLE-BUCKET/*",
        "Condition": {
            "Null": {
                "s3:x-amz-server-side-encryption-aws-kms-key-id": "true"
            }
        }
    }]
}