Fix class_implements() on enum case objects (#5651)

[PurHur]

Summary

• class_implements(E::A) on backed/unit enum cases now resolves the declaring enum ClassEntry (TYPE_ENUM_CASE and enum-case objects) instead of returning false
• classImplementsMap() maps implicit unitenum/backedenum registry keys to UnitEnum/BackedEnum display names (fixes enum type operands too, pairs Stdlib: class_implements() on enum must return UnitEnum/BackedEnum (ext/standard/basic_functions.c) #5422)
• JIT lowering uses the same display-name mapping for enum interface lists

Closes #5651

php-src reference

• ext/standard/basic_functions.c — PHP_FUNCTION(class_implements), object branch
• Zend/zend_enum.c — enum case objects implement UnitEnum / BackedEnum

Verification

Issue repro (Zend vs VM):

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php -r "enum E:int{case A=1;} var_dump(class_implements(E::A));"
php bin/vm.php -r "enum E:int{case A=1;} var_dump(class_implements(E::A));"
'

Both emit array(2) { ["UnitEnum"]=>... ["BackedEnum"]=>... }.

Compliance + unit tests:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit --filter class_implements_enum
vendor/bin/phpunit --filter ClassImplementsBuiltinTest
'

Output:

OK (1 test, 1 assertion)
OK (5 tests, 5 assertions)

Test plan

• Issue repro green on VM
• class_implements_enum_case_object.phpt compliance case
• ClassImplementsBuiltinTest::testVmClassImplementsOnEnumCaseObject

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