Add formatted date formatter for datetime and daterange fields

The existing TimestampCeFieldFormatter supports timestamp, created, and changed fields which store Unix timestamps. However, datetime and daterange fields store ISO date strings (e.g., 2025-04-10T09:00:00) and are not supported.
There is no built-in custom elements formatter for datetime and daterange field types. Users needing formatted date output with timezone and date format support for these field types must write a custom formatter.

Solution
Add a DateTimeCeFieldFormatter that extends TimestampCeFieldFormatter to support datetime and daterange fields. It:

• Reuses the same configuration form (date format, custom format, timezone)
• Parses ISO date strings via DrupalDateTime instead of using DateFormatterInterface::format() (which expects Unix timestamps)
• Handles daterange fields by outputting {value, endValue} objects
• Supports single and multi-cardinality fields