ECA content: the condition to compare field values doesn't work correctly with boolean fields

Issue information

From user: jurgenhaas

Contribution record

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Problem/Motivation

When comparing a boolean field (e.g. the field in_draft in webform submissions) with something (usually "0" or "1"), that always fails because \Drupal\eca_content\Plugin\ECA\Condition\EntityFieldValue::getFieldValues always returns an empty value for boolean fields.

The reason for that is that the property is a \Drupal\Core\TypedData\Plugin\DataType\BooleanData and that return a boolean which gets casted to string with this:

<?php
if ($property instanceof PrimitiveInterface) {
  $values[] = (string) $property->getValue();
}
?>

Proposed resolution

For boolean data, let's cats to integer first and then cast to string.