Add string field for date columns and ColumnCodeProducer cleanup

[mringler]

Currently, temporal columns are stored as DateTimeInterface objects, which are created when the model object is hydrated.

This PR stores the value as string, the DateTimeInterface object is only created on access and stored in a second object property. Using the date string as default means fewer object have to be created (as long as the date field is not accessed), and it provides a value for binding to prepared statements without having to call DateTimeInterface::format().

Splitting database fields into a raw value and a deserialized value attribute is used for all columns with serialization (like types OBJECT, BINARY_SET, ARRAY), and I used the occasion to unify that code into a new AbstractDeserializableColumnCodeProducer, which all those CodeProducers extend now.

Changing the way time columns work affected code in ObjectBuilder, which I split up and moved into the corresponding CodeProducers (like ObjectBuilder::addClear(), ObjectBuilder::addHydrateBody()).

Also, the ColumnCodeProducers now use a method that creates the whole variable access string ('$this->my_field'), which makes template code much more readable:

        $stringAttribute = $this->getAttributeName();
        $arrayAttribute = $this->getDeserializedAttributeName();

        $script .= "
        if ($arrayAttribute === null) {
            $arrayAttribute = !$stringAttribute ? [] : static::unserializeArray($stringAttribute);
        }";

instead of

        $clo = $this->column->getLowercasedName();
        $cloUnserialized = $clo . '_unserialized';

        $script .= "
        if (!\$this->$cloUnserialized && \$this->$clo !== null) {
            \$this->$cloUnserialized = !\$this->$clo ? [] : static::unserializeArray(\$this->$clo);
        }";

---

I disabled a broken sniffer rule from Spryker, it does not recognize that a param string|null $param is nullable (only ?string $param is considered nullable). This is an issue in spryker/code-sniffer/Spryker/Sniffs/Commenting/DocBlockParamAllowDefaultValueSniff.php.

---

Psalm currently has a bug where it complains about the #[\Override] attribute on functions (see bug report), causing CI to fail.

[mringler]

This breaks BC when a new DateTimeInterface object is set and then its value is changed:

$date = new DateTime(...);
$row->setDate($date);
$date->setTime(...); // <----- will not change actual value in $row, but did before
$row->save();

Note that neither version stores such a change when the object from the row is used:

$row = RowQuery::create()->findOne();
$row->getDate()->setTime(...);
$row->save(); // field is not marked as changed, so nothing happens 

[codecov]

Codecov Report

❌ Patch coverage is 96.17347% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...Builder/ColumnTypes/LazyLoadColumnCodeProducer.php	85.71%	5 Missing ⚠️
...ctBuilder/ColumnTypes/ObjectColumnCodeProducer.php	85.18%	4 Missing ⚠️
...m/ObjectBuilder/ColumnTypes/ColumnCodeProducer.php	94.44%	3 Missing ⚠️
src/Propel/Runtime/Adapter/Pdo/PdoAdapter.php	88.88%	2 Missing ⚠️
...bjectBuilder/ColumnTypes/LobColumnCodeProducer.php	88.88%	1 Missing ⚠️

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