AWS::Redshift::IdcApplication - [Coverage] - Add Resource for Managing Redshift IAM Identity Center Connections

### Name of the resource

Other

### Resource name

AWS::Redshift::IdcApplication

### Description

Add support for creating connections to IAM Identity Center via CloudFormation, enabling this configuration to be managed. This eliminates the need for manual creation of resources or reliance on the API, simplifying workflows.

### Other Details

Feature:
- https://docs.aws.amazon.com/redshift/latest/mgmt/redshift-iam-access-control-idp-connect.html

AWS Blog post example:
- https://aws.amazon.com/blogs/big-data/integrate-identity-provider-idp-with-amazon-redshift-query-editor-v2-and-sql-client-using-aws-iam-identity-center-for-seamless-single-sign-on/

APIs:
- https://docs.aws.amazon.com/redshift/latest/APIReference/API_CreateRedshiftIdcApplication.html
- https://docs.aws.amazon.com/redshift/latest/APIReference/API_DeleteRedshiftIdcApplication.html
- https://docs.aws.amazon.com/redshift/latest/APIReference/API_DescribeRedshiftIdcApplications.html
- https://docs.aws.amazon.com/redshift/latest/APIReference/API_ModifyRedshiftIdcApplication.html

Start with the Redshift IAM Identity Center connection documentation and the linked CreateRedshiftIdcApplication, DeleteRedshiftIdcApplication, DescribeRedshiftIdcApplications, and ModifyRedshiftIdcApplication API references. Done means CloudFormation can manage the AWS::Redshift::IdcApplication resource for these connection operations without manual creation or direct API use.

Written by the indexing model from the issue text.