[php-src] Issue #14385: First class callable for instance methods

Issue: https://github.com/php/php-src/issues/14385 Author: rela589n ### Description Hi there! I would like to propose following syntax sugar: ```php /** @var SurveyTemplate[] $templates */ $templateIds = array_map(SurveyTemplate::getId(...), $templates); ``` As the replacement for more verbose instance method call: ```php /** @var SurveyTemplate[] $templates */ $templateIds = array_map(static fn (SurveyTemplate $surveyTemplate): Uuid => $surveyTemplate->getId(), $templates); ``` Currently, first class callable methods allow to wrap only static method, while in current place non-static method is suggested to use. Please, let me know what you think about it.