feat(stepfunctions-tasks): create scheduler (#29458)

### Issue # (if applicable)

Closes #29351.

### Reason for this change

Although the creation of schedule task is supported, the AWS CDK currently lacks the capability to create these without a custom task definition.

### Description of changes

I've introduced the `EventBridgeSchedulerCreateScheduleTask` class to address this gap.

The original issue discussed the need for both creating and updating schedules. However, to maintain focus and simplicity, this PR will only cover the creation aspect. A subsequent PR will be dedicated to schedule updates.

### Description of how you validated changes

I have added both integ and unit tests.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*