Use validator method instead of ValidateType, Added onDispose property

[MahmoudKEA]

• Added validator property
• Added onDispose property Add onDispose callable method #36
• validateText is deprecated
• validateType is deprecated

AiBarcodeScanner(
  validator: (value) {
    return value.startsWith('https://');
  },
  onDispose: () {
    debugPrint("Barcode scanner disposed!");
  },
);

[rvndsngwn]

I greatly appreciate your work, @MahmoudKhalid. Thanks a lot.

[MahmoudKEA]

@rvndsngwn Thanks too, I noticed that I forgot to update the README.md file to use validator instead of ValidateText and validateType

[rvndsngwn]

@rvndsngwn Thanks too, I noticed that I forgot to update the README.md file to use validator instead of ValidateText and validateType

The README.md file has been updated to reflect the latest release, version 0.0.5.