Explicit mapping for ARN field

[surajkota]

Is your feature request related to a problem?
Currently, the code generator expects the ARN field name to be Arn or ResourceName+Arn (case insensitive) which does not match for some resources like ModelQualityJobDefinition in SageMaker ARN field is named JobDeifinitionArn.

Describe the solution you'd like
option to specify isARN under field_config similar to isOwnerAccountId

Describe alternatives you've considered
None

[RedbackThomson]

Perhaps another acceptable solution would be to support another field as part of the resource such as ARNField or ARNFieldName.

[jaypipes]

Perhaps another acceptable solution would be to support another field as part of the resource such as ARNField or ARNFieldName.

I'd prefer to use FieldConfig.is_arnto align with the other boolean field attributes.