extensions/validation_extension library

1. flutter_basic_utils_ultra package
2. documentation
3. extensions/validation_extension.dart

flutter_basic_utils_ultra package

1. Libraries
2. extensions/data_types_extensions
3. extensions/date_extensions
4. extensions/spacing_extensions
5. extensions/string_extension
6. extensions/texttheme_extension
7. extensions/validation_extension
8. flutter_basic_util
9. utils/debounce
10. utils/dimensions
11. utils/functions
12. utils/launcher
13. utils/loggers
14. utils/num_format
15. utils/spacing
16. utils/validators