feat: add vCard file sharing support in iOS share extension

[Kasendwa]

feat: add vCard file sharing support in iOS share extension

Description

Adds native vCard (contact) file sharing support to the iOS share extension, allowing users to share contact files (.vcf) from other apps directly into Expo apps.

Changes

• Added vcardContentType constant for "public.vcard" MIME type
• Implemented handleVCard function with comprehensive error handling
• Added vCard detection logic in the main content processing flow
• Support for both URL and Data attachment types
• Automatic .vcf file extension assignment for proper MIME type resolution
• Enhanced logging for debugging vCard processing

Technical Details

The implementation handles vCard data as both URL references and raw Data objects. When processing Data objects, it creates temporary .vcf files to ensure proper MIME type resolution. Uses Task.detached for async file operations off the main thread.

Testing

To test vCard sharing functionality, set your iosActivationRules to the following :

`SUBQUERY(
    extensionItems,
    $item,
    SUBQUERY(
	    $item.attachments,
	    $attachment,
	    (
	    ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.url" ||
	    ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.image" ||
	    ANY $attachment.registeredTypeIdentifiers == "public.vcard" ||
	    ANY $attachment.registeredTypeIdentifiers == "public.text" ||
	    ANY $attachment.registeredTypeIdentifiers == "public.data" ||
	    ANY $attachment.registeredTypeIdentifiers == "com.adobe.pdf"
	    )
    ).@count == 1
  ).@count == 1`

[achorein]

LGTM, thanks