PHP API Ref: Add Symfony Event

[adriendupuis]

Question	Answer
JIRA Ticket
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Edition

Add Symfony\Contracts\EventDispatcher\Event to PHP API Ref to fix classes extending it by adding the two methods isPropagationStopped and stopPropagation.

Example:

• https://doc.ibexa.co/en/latest/api/php_api/php_api_reference/classes/Ibexa-Contracts-ActivityLog-Event-PostActivityGroupListLoadEvent.html have two methods.
• https://ez-systems-developer-documentation--2542.com.readthedocs.build/en/2542/api/php_api/php_api_reference/classes/Ibexa-Contracts-ActivityLog-Event-PostActivityGroupListLoadEvent.html#method_getList have four methods and a link to the new doc page https://ez-systems-developer-documentation--2542.com.readthedocs.build/en/2542/api/php_api/php_api_reference/namespaces/symfony-contracts-eventdispatcher.html

Checklist

• Text renders correctly
• Text has been checked with vale
• Description metadata is up to date
• Redirects cover removed/moved pages
• Code samples are working
• PHP code samples have been fixed with PHP CS fixer
• Added link to this PR in relevant JIRA ticket or code PR

[adriendupuis]

To add a third party class to our doc may look off topic. To have only one class from the Symfony\Contracts namespace may look incomplete. The namespace could be hidden from the sidebar and just accessible through the "Extends Event" link on Ibexa classes using it.