[AWS::SSM::ServiceSetting] - [Coverage] - Missing resource for FSBP SSM.7

### Name of the resource

_
### Resource name

AWS::SSM::ServiceSetting

### Description

I am requesting CloudFormation support for the `AWS::SSM::ServiceSetting` resource.

Specifically, I need to manage the **Block Public Sharing** setting for SSM documents to comply with the AWS Security Hub control **[[SSM.7]](https://docs.aws.amazon.com/securityhub/latest/userguide/ssm-controls.html#ssm-7)**.
To satisfy this control, the service setting `arn:aws:ssm:::servicesetting/ssm/documents/console/public-sharing-permission` must be set to `Disable`.

Currently, there is no native CFn resource to manage this configuration, forcing us to rely on Custom Resources or manual CLI commands (`aws ssm update-service-setting`).

#### Example

```yaml
Type: AWS::SSM::ServiceSetting
Properties:
SettingId: /ssm/documents/console/public-sharing-permission
SettingValue: Disable
```

### Other Details

- Security Hub Control: [[SSM.7]](https://docs.aws.amazon.com/securityhub/latest/userguide/ssm-controls.html#ssm-7) [SSM documents should have the block public sharing setting enabled](https://docs.aws.amazon.com/securityhub/latest/userguide/ssm-controls.html#ssm-7)
- AWS CLI: [update-service-setting](https://docs.aws.amazon.com/cli/latest/reference/ssm/update-service-setting.html)
- Terraform Equivalent: [aws_ssm_service_setting](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ssm_service_setting)

Start with the requested AWS::SSM::ServiceSetting resource and the linked AWS CLI update-service-setting and Terraform aws_ssm_service_setting documentation. Confirm the SettingId and SettingValue behavior for the Block Public Sharing setting; done means CloudFormation can declaratively manage this configuration for the SSM.7 control.

Written by the indexing model from the issue text.