Issue #3486955: Add an enum for 'view'/'form' display types in field display APIs (!13024) · Merge requests · project / drupal

Introduce a new enum Drupal\Core\Field\DisplayContext with cases View and Form.
Update field display methods to accept string|DisplayContext.
Add BC handling: string values are still supported, but invalid strings now trigger deprecation warnings.
Add kernel tests (DisplayContextTest) to ensure:
- Enum values work correctly.
- Backward compatibility with strings is preserved.
- Deprecation warnings are raised for invalid strings.

Issue #3486955: Add an enum for 'view'/'form' display types in field display APIs