feat: add support for Coptic Calendar to ion-datetime

[mamitry]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already include this feature request, without success.

Describe the Feature Request

I am developing a Coptic books app using the Ionic framework. Currently, the ion-datetime component supports Gregorian and other common calendars, but it lacks support for the Coptic calendar, which is essential for my target audience.

Describe the Use Case

• Allow users to select dates according to the Coptic calendar.
• Display event dates, publication dates, and other time-related information in the Coptic calendar format.
• Enhance user experience for users who follow the Coptic liturgical calendar.

Describe Preferred Solution

• Introduce a new calendar attribute in the ion-datetime component that accepts calendar types (e.g., gregorian, coptic).
• Utilize existing libraries that support the Coptic calendar for date calculations and formatting.
• Provide localization options to display month names, day names, and other date-related strings in the Coptic language as needed.

Describe Alternatives

i haven't found any alternative

Related Code

No response

Additional Information

Benefits:

• Expands the accessibility of Ionic apps to communities that use the Coptic calendar.
• Aligns with Ionic's commitment to supporting diverse user bases and cultural practices.
• Enhances the flexibility and versatility of the ion-datetime component.