Stdlib: IntlListFormatter on PROFILE=8.5 (#23229)

[PurHur]

Summary

• Implements IntlListFormatter (PHP 8.5) via ICU ulistfmt_* FFI in ext/intl/VmIntlListFormatter.php — php-src ext/intl/listformatter/
• Gates on host extension_loaded('intl') and PHP_COMPILER_PROFILE≥8.5 (no phantom class_exists)
• Compliance + unit + repro; serialize denied; inventory/spine synced

Test plan

• Host (intl loaded): PHP_COMPILER_PROFILE=8.5 php bin/vm.php test/repro/maintainer_gap_intl_list_formatter_85.php → A, B, and C
• Host: PHP_COMPILER_PROFILE=8.2 php bin/vm.php test/repro/maintainer_gap_intl_list_formatter_absent.php → class withheld
• Host: php -d memory_limit=1536M vendor/bin/phpunit --filter 'VmIntlListFormatterTest|intl_list_formatter' → OK (5 tests)
• Docker: inventory OK 6562/6562 + spine coverage sync OK; list-formatter PHPTs skip without host intl
• intl_phantom_classes.phpt includes intllistformatter=0

Closes #23229

Verification transcript (host)

$ PHP_COMPILER_PROFILE=8.5 php bin/vm.php test/repro/maintainer_gap_intl_list_formatter_85.php
class=1
format=A, B, and C
format2=A, B, and C
ok

$ PHP_COMPILER_PROFILE=8.2 php bin/vm.php test/repro/maintainer_gap_intl_list_formatter_absent.php
class=0
ok

$ php -d memory_limit=1536M vendor/bin/phpunit --filter 'VmIntlListFormatterTest|intl_list_formatter'
OK (5 tests, 11 assertions)

php-src ref: ext/intl/listformatter/listformatter.stub.php / listformatter_class.cpp (GH-18519).
No new runtime/*.c logic.

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