Stdlib: ReflectionProperty getHooks string keys + getHook() (#4806)

[PurHur]

Summary

• ReflectionProperty::getHooks() now returns an associative array keyed by "get" / "set" (php-src ext/reflection/php_reflection.c), not numeric PropertyHookType backing indices 0/1.
• Add ReflectionProperty::getHook(PropertyHookType) returning ReflectionMethod with Zend-style name $prop::get / $prop::set, or null when absent.
• Note: php-src master stub has no setHook() — issue repro checked; only getHooks/getHook are in php_reflection.stub.php.

php-src reference

• ext/reflection/php_reflection.c — ReflectionProperty::getHooks, getHook
• ext/reflection/php_reflection.stub.php

PHP implementation

• lib/VM/ReflectionPropertyHookSupport.php — string-key hook map + hookReflectionMethod()
• lib/VM/Builtin/ReflectionPropertyGetHooks.php — HashTable::add('get'|'set', …)
• lib/VM/Builtin/ReflectionPropertyGetHook.php — new VM builtin

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_reflection_property_gethooks.php
# getHooks yes / getHook yes / get,set / getHook-rm

PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/compliance/cases/reflection/reflection_property_hook_gethooks_keys.phpt
# get,set + getHook-rm + $label::get

PHP_COMPILER_PROFILE=8.4 php -d memory_limit=1536M vendor/bin/phpunit --filter reflection_property_hook_gethooks
# OK (1 test)

php bin/compile.php -l test/compliance/cases/reflection/reflection_property_hook_gethooks_keys.phpt
# compile_ok
'

Closes #4806

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