feat(database): add #[Hashed] and #[Encrypted] attributes

[innocenzi]

This pull request adds support for a new #[Hashed] and #[Encrypted] attributes, expected to be used on database models.

final class User
{
    public PrimaryKey $id;

    public string $email;

    #[Hashed]
    public ?string $password;

    #[Encrypted]
    public ?string $accessToken;
}

To ease their implementation, I came up with a new ProvidesCaster and ProvidesSerializer interfaces. These interfaces can be implemented by attributes, which may provide specific serializers and casters.

#[Attribute(Attribute::TARGET_PROPERTY)]
final class Hashed implements ProvidesSerializer
{
    public string $serializer {
        get => HashedSerializer::class;
    }
}

#[Attribute(Attribute::TARGET_PROPERTY)]
final class Encrypted implements ProvidesSerializer, ProvidesCaster
{
    public string $serializer {
        get => EncryptedSerializer::class;
    }

    public string $caster {
        get => EncryptedCaster::class;
    }
}

This is an alternative to #[CastWith] and #[SerializeWith], but they are still useful—their purpose is just slightly different.

[brendt]

I like it!

I have one remark, and was also wondering if you could add the docs for it within this PR?

Docs added

[innocenzi]

The docs are sparse but I plan on updating the db docs anyway, since the ORM refactor