Add support to display Holidays Integration to Calendar Timeline Flutter.

[iam-niraj]

Currently, implementing holiday API in the Calendar Timeline Flutter has proven to be difficult. As a result, I propose the addition of a built-in holiday API integration to simplify the process for users.

The feature should include the ability to easily access and integrate popular holiday APIs such as Google Calendar API, Holiday API, or any other commonly used holiday API. This would allow users to automatically display holiday events on their calendar timeline without the need for complex coding or manual input.

Overall, this feature would greatly enhance the usability and convenience of the Calendar Timeline Flutter for users looking to display holidays on their timeline.

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