Validation for Hypervel

Documentation: https://hypervel.org/docs/validation

Differences From Laravel

• String rule parameters use standard CSV quoting with literal backslashes. See rule parameters.
• The encoding rule rejects numbers, booleans, and non-nullable null; it does not coerce scalar values to strings.
• Date comparison rules allow a referenced field to be missing or null unless it is also required. Unparseable date strings and invalid referenced values fail validation instead of being compared with null.
• Rule keys may escape a literal asterisk as \*, matching the existing \. literal-dot syntax.
• Laravel's deprecated InvokableRule contract is not provided. Implement ValidationRule and its validate() method instead.

Ported from: https://github.com/laravel/framework