feat: add support for repository_dispatch event

This pull request makes a minor update to the event handling logic in `src/ActionWrapper.psm1`. The change ensures that the `repository_dispatch` event is now handled in the same way as scheduled events. * Added support for the `repository_dispatch` event by mapping it to the `Initialize-Scheduled` function in the `Invoke-Action` handler. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added support for the repository_dispatch event, allowing workflows to be triggered via the repository API or external integrations. This complements existing schedule and manual triggers, enabling automated runs initiated by third-party systems. * **Other** * No changes to public interfaces; behavior remains consistent aside from the new trigger option. <!-- end of auto-generated comment: release notes by coderabbit.ai -->