[php-src] Issue #11391: Impl. `ReflectionFunctionAbstract::getStartColumn` (and getEndColumn)

Issue: https://github.com/php/php-src/issues/11391 Author: mvorisek ### Description Currently only line can be obtained by reflection. AFAK this limitation is comming from AST as only line and no column is stored to save memory. I cannot tell if storing file column is worth now/in 2023 for every AST node, but I would welcome the column number to be stored for classes and functions to get able to get the column number via reflection and locate the source code more precisely. In our usecase, we use the reflection data to highlight a Closure in a file and with short closures, more than one Closure can be present on 1 line with actual PSR-12 style, ie. currently a Closure instance cannot be mapped to a code section.