PHPORM-206 Add model schema version feature

[florianJacques]

Added a feature for managing mongoDB document versioning. The default key is "schema_version" If the version is not specified, t is automatically set to 1

Usage

use MongoDB\Laravel\Eloquent\HasDocumentVersion;
use MongoDB\Laravel\Eloquent\Model as Eloquent;

/** @property int $schema_version */
class SchemaVersionned extends Eloquent
{
    use HasSchemaVersion;

    public const int SCHEMA_VERSION = 1;

    protected $connection       = 'mongodb';
    protected $collection       = 'documentVersion';
    protected static $unguarded = true;
}

For overwrite version key:

/** @property int $__v */
class DocumentVersion extends Eloquent
{
    use HasSchemaVersion;

    protected $connection       = 'mongodb';
    protected $collection       = 'documentVersion';
    protected static $unguarded = true;

    public static function getSchemaVersionKey(): string
    {
       return '__v';
    }
}

For update document version:

/** @property int $schema_version */
class DocumentVersion extends Eloquent
{
    use HasSchemaVersion;

    public const int SCHEMA_VERSION = 2;

    protected $connection       = 'mongodb';
    protected $collection       = 'documentVersion';
    protected static $unguarded = true;
}

• [x] Add tests and ensure they pass
• [x] Add an entry to the CHANGELOG.md file
• [x] Update documentation for new features

[florianJacques]

Thanks for your work !

[GromNaN]

Thank you @florianJacques