Fixed infinite save loop #16395

[rudiservo]

Hello!

• Type: bug fix
• Link to issue: [[BUG]: ORM infinite save loop #16395]

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• I have created a PR for the documentation about this change

Small description of change:
Added an array with already visited objects by the save or the SaveRelated chain functions in order to avoid save loops
Performance Tests where made between SplObjectStorage and the PHP Array.
There are two function to get a unique ID from a Php object, spl_object_hash and spl_object_id.
Using spl_object_hash, SplObjectStorage is faster and uses less memory, spl_object_storage is the function SplObjectStorage uses.
Using the spl_object_id the php Array is faster and uses less memory by a small margin, however since Zephir cannot pass by reference, SplObjectStorage is the better option.

Thanks

[Jeckerson]

@rudiservo please rebase this branch.

[rudiservo]

@Jeckerson I think it's ok now.