(aws-scheduler-alpha): Override target properties in schedule

[filletofish]

Describe the feature

If customers wish to reuse the same target in multiple schedules, they should be able to override target properties like input, maximumRetryAttempts and maximumEventAge when creating a Schedule:

const target = new targets.LambdaInvoke(props.func, {
    input: ScheduleTargetInput.fromObject({
        "payload": "useful"
    }),
});

const schedule1 = new Schedule(this, 'Schedule', {
    scheduleExpression: ScheduleExpression.cron({ day: '20' }),
    target,
});

const schedule2 = new Schedule(this, 'Schedule2', {
    scheduleExpression: ScheduleExpression.cron({ day: '5' })
    target,
    targetOverrides: {
        input: ScheduleTargetInput.fromText("Overriding Target Input")
    }
});

See https://github.com/aws/aws-cdk-rfcs/blob/main/text/0474-event-bridge-scheduler-l2.md#overriding-target-properties

Use Case

It will be useful for customers who wish to reuse the same target in multiple schedules.

Proposed Solution

Add property targetOverrides to ScheduleProps that is being used during creation of CfnSchedule.

export interface TargetOverrideProps {
  readonly input?: ScheduleTargetInput;
  readonly maximumEventAge?: Duration;
  readonly maximumRetryAttempts?: number;
}

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.99.1

Environment details (OS name and version, etc.)

MacOS

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