Launch flutter_validators 1.3

[divyanshub024]

Summary

• add generic FieldValidator<T> composition, fluent chaining, and dependency-free message resolution
• add opt-in strict/configurable validation plus numeric, date/time, text, finance, identifier, hash, MIME, and data-URI validators
• rewrite the README and migration/strict/message/composition guides with tested examples
• replace the sample app with five interactive validation flows and widget coverage
• update package metadata to 1.3.0 and strengthen release CI with coverage, docs, example tests, pure Dart smoke, and pub dry-run checks

Compatibility

Existing 1.2 public symbols and permissive defaults remain. Non-required form validators continue to accept null and empty values; strict validation is opt-in.

Validation

• dart format --output=none --set-exit-if-changed lib test tool example/lib example/test
• dart analyze
• 184 Dart tests
• flutter analyze
• 5 Flutter widget tests
• 96.64% line coverage
• API docs generation with zero warnings
• pure Dart smoke test
• clean dart pub publish --dry-run with zero warnings