feat: add missing Laravel casts

[binaryfire]

This PR adds the 10 primitive cast types that Laravel has but Hypervel/Hyperf lacks, bringing Hypervel's model casting capabilities to feature parity with Laravel.

New Cast Types

Cast	Description
encrypted	AES-256 encrypted value
encrypted:array	Encrypted JSON → array
encrypted:collection	Encrypted JSON → Collection
encrypted:json	Encrypted JSON → array
encrypted:object	Encrypted JSON → stdClass
hashed	One-way bcrypt/argon hash
immutable_date	DateTimeImmutable date
immutable_datetime	DateTimeImmutable datetime
immutable_custom_datetime	DateTimeImmutable with custom format
json:unicode	JSON with JSON_UNESCAPED_UNICODE flag

Changes

Hash Package

• Added verifyConfiguration() to BcryptHasher, ArgonHasher, Argon2IdHasher, and HashManager
• This method verifies that a hash was created with valid configuration parameters (not exceeding current config)
• Added @method annotation to Hash facade for IDE support

Core Package (HasAttributes)

• Added encryption helper methods: encryptUsing(), currentEncrypter(), isEncryptedCastable(), fromEncryptedString(), castAttributeAsEncryptedString()
• Added hashing helper method: castAttributeAsHashedString()
• Added JSON unicode support: getJsonCastFlags(), isJsonCastable() override
• Added immutable datetime detection: isImmutableCustomDateTimeCast()
• Overrode castAttribute() to handle new cast types (refactored to use match expression)
• Overrode setAttribute() to encrypt/hash values on set
• Added $primitiveCastTypes to Model, Pivot, and MorphPivot classes

Usage Examples

class User extends Model
{
    protected function casts(): array
    {
        return [
            // Encrypted values - automatically encrypted on set, decrypted on get
            'api_key' => 'encrypted',
            'settings' => 'encrypted:array',

            // Hashed values - automatically hashed on set
            'password' => 'hashed',

            // Immutable dates - returns CarbonImmutable instead of Carbon
            'birth_date' => 'immutable_date',
            'created_at' => 'immutable_datetime',

            // JSON with unicode support
            'metadata' => 'json:unicode',
        ];
    }
}

Test Coverage

• 12 new tests for verifyConfiguration() across all hashers
• 19 new tests for the new cast types covering:
  • Immutable date/datetime casts (3 tests)
  • JSON unicode preservation (2 tests)
  • Encrypted cast roundtrip - all 5 variants (5 tests)
  • Hashed cast - plain text and existing hash handling (3 tests)
  • Null value handling for encrypted/hashed casts (3 tests)
  • encryptUsing() custom encrypter API (3 tests)