Collect EMR Security Configuration Information

[PercussiveElbow]

I noticed the EMR collection does not gather information on EMR Security Configurations at present and have added support for this.

Collecting these configurations would be useful as they indicate whether various security features are enforced on a given EMR cluster, e.g. transit and at-rest encryption.

Example of information returned

 {
    "account": "123456789",
    "service": "EMR",
    "region": "eu-west-2",
    "resource": {
      "EncryptionConfiguration": {
        "InTransitEncryptionConfiguration": {
          "TLSCertificateConfiguration": {
            "CertificateProviderType": "PEM",
            "S3Object": "s3://test123/Test123.zip"
          }
        },
        "AtRestEncryptionConfiguration": {
          "S3EncryptionConfiguration": {
            "EncryptionMode": "SSE-S3"
          },
          "LocalDiskEncryptionConfiguration": {
            "EncryptionKeyProviderType": "AwsKms",
            "AwsKmsKey": "arn:aws:kms:eu-west-2:123456789:alias/1234-5678",
            "EnableEbsEncryption": true
          }
        },
        "EnableInTransitEncryption": true,
        "EnableAtRestEncryption": true
      },
      "AuthenticationConfiguration": {
        "KerberosConfiguration": {
          "Provider": "ClusterDedicatedKdc",
          "ClusterDedicatedKdcConfiguration": {
            "TicketLifetimeInHours": 24
          }
        }
      },
      "type": "security_configuration",
      "arn": "arn:aws:emr:eu-west-2:123456789:security-configuration/TestSecConfig"
    },
    "timestamp": "2022-02-28 00:17:47 UTC"
  }

References to applied security configurations are already returned in the security_configuration field in EMR cluster objects.

No ARN format existed for this data structure, so I've followed the solution for similar objects in the code. (i.e. made one up)

If there are any issues with this PR please do let me know. Also, thanks for this gem - it is incredibly useful.

[joshlarsen]

Hey @PercussiveElbow, thanks for the PR. I think this is a good addition. One small request though, list_security_configurations returns a pageable response. If you could adjust your new block to match the list_clusters pattern that handles paging, that would be great.

Thanks!

[PercussiveElbow]

Updated now to match that format, let me know if anything else needs done. Thanks!