Add PasswordLength to AWS::SecretsManager::RotationSchedule HostedRotationLambda

### Name of the resource

AWS::SecretsManager::RotationSchedule

### Resource name

HostedRotationLambda

### Description

When you [generate a new secret](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-secretsmanager-secret-generatesecretstring.html), you're allowed to specify password length. I think it also makes sense to include password length as a parameter for rotation schedule. The [documentation](https://docs.aws.amazon.com/secretsmanager/latest/userguide/rotating-secrets.html) says, "In the [database rotation templates](https://docs.aws.amazon.com/secretsmanager/latest/userguide/reference_available-rotation-templates.html) provided by Secrets Manager, the Lambda function generates a 32 character password for the new version," but sometimes they are [limited to less](https://github.com/aws-samples/aws-secrets-manager-rotation-lambdas/blob/master/SecretsManagerRDSOracleRotationSingleUser/lambda_function.py#L118) (30 for Oracle, which is the correct limit). I'd like to see the length be exposed as a parameter for rotation schedule so you can match it to the length you specified when creating the secret. This is related to a [CDK issue](https://github.com/aws/aws-cdk/issues/27608).

### Other Details

_No response_

Start with the AWS::SecretsManager::RotationSchedule resource and its HostedRotationLambda property, then review the linked secret-generation and rotation documentation and the related CDK issue. Done means PasswordLength is exposed as a rotation-schedule parameter and the hosted rotation Lambda uses it while respecting the documented service limits.

Written by the indexing model from the issue text.