Schedule Configuration Change for Agent in Central Agent Configuration

**Is your feature request related to a problem? Please describe.**
Currently, configuration changes must be applied immediately or manually at a later time. This can be inconvenient for users who need to apply changes during off-peak hours or at a specific time to minimize disruption.

**Describe the solution you'd like**
I would like to request a new feature in Kibana's Central Agent Configuration that allows users to schedule a configuration change for an agent at a specific date and time. This would improve flexibility and control over configuration changes, allowing users to plan and automate updates more efficiently.

**Describe alternatives you've considered**
An alternative solution could be to use external scheduling tools or scripts to apply configuration changes at the desired time. However, this approach lacks the integration and ease of use that a built-in scheduling feature would provide.

We have already implemented something similar integrated in Elastic. Using an index that contains the configuration changes schedule and a Watcher that applies the configuration using the Kibana [API](https://www.elastic.co/guide/en/observability/8.17/apm-agent-config-api.html) .


**Additional context**
Adding a scheduling option in the Central Agent Configuration interface would ensure that scheduled changes are logged and can be reviewed or modified if necessary. This feature would greatly enhance the usability and efficiency of Kibana's Central Agent Configuration.