Properties with oneOf indicator

[ewbankkit]

Relates #156

CloudFormation resource schema defined properties may include the oneOf indicator, for example AWS::S3Outposts::Bucket:

    "FilterAndOperator": {
      "oneOf": [
        {
          "type": "object",
          "additionalProperties": false,
          "required": [
            "Tags"
          ],
          "properties": {
            "Prefix": {
              "description": "Prefix identifies one or more objects to which the rule applies.",
              "$ref": "#/definitions/FilterPrefix"
            },
            "Tags": {
              "description": "All of these tags must exist in the object's tag set in order for the rule to apply.",
              "type": "array",
              "uniqueItems": true,
              "minItems": 1,
              "items": {
                "$ref": "#/definitions/FilterTag"
              }
            }
          }
        }
      ]
    }

Currently our CloudFormation resource schema SDK ignores the oneOf indicator and when we come to generate a Terraform resource schema for the property it has no type.

It is not currently clear how to handle such properties.

[ewbankkit]

Similarly for AWS::S3ObjectLambda::AccessPoint:

                "ContentTransformation": {
                    "type": "object",
                    "oneOf": [
                        {
                            "additionalProperties": false,
                            "properties": {
                                "AwsLambda": {
                                    "$ref": "#/definitions/AwsLambda"
                                }
                            },
                            "required": [
                                "AwsLambda"
                            ]
                        }
                    ]
                }

[ewbankkit]

AWS::S3::StorageLens:

    "Encryption": {
      "description": "Configures the server-side encryption for Amazon S3 Storage Lens report files with either S3-managed keys (SSE-S3) or KMS-managed keys (SSE-KMS).",
      "type": "object",
      "oneOf": [
        {
          "additionalProperties": false,
          "properties": {
            "SSES3": {
              "description": "S3 default server-side encryption.",
              "type": "object",
              "additionalProperties": false
            }
          },
          "required": [
            "SSES3"
          ]
        },
        {
          "additionalProperties": false,
          "properties": {
            "SSEKMS": {
              "$ref": "#/definitions/SSEKMS"
            }
          },
          "required": [
            "SSEKMS"
          ]
        }
      ]
    },