N°6275 - Propose CaseLog extensibility API to manage history

[odain-cbd]

Why?
ormCaseLog tend to become huge sometimes (seen in iTop SaaS infrastructure). it could be nice to implement some shrinking logic.

There is also a remaining bug regarding broken indexes:

N°5341 - Repair misalignment between Caselog and caselog index

Current PR aims at proposing an extension API to manipulate ormCaseLog objects (while calling constructor/AddLogEntry* methods). With such an API we could for example propose some repairment algorithm apart from any iTop release.

** Configuration **
Once you have written your own classes that implement iOrmCaseLogExtension interface, you have also to configure which one will be enabled via iTop following configuration variable: ormcaselog_extension_classes
This is the sorted list of enabled extension.

Example of proposed configuration (config-itop.php):

'ormcaselog_extension_classes' => [
'Combodo\\iTop\\Extension1',
'Combodo\\iTop\\Extension2',
'Combodo\\iTop\\Extension3',
]