Stdlib: DateTime / DateTimeZone OOP (ext/date parity, #3072)

[PurHur]

Summary

• Register VM builtin DateTime and DateTimeZone classes with phase-1 methods: __construct, format, getTimestamp, setTimezone (DateTimeZone: __construct only).
• Parsing/formatting delegates to host PHP DateTime/DateTimeZone for Zend parity on UTC and named timezones.
• Adds compliance PHPT + unit tests and capability-syntax row.

php-src reference

• ext/date/php_datetime.c, ext/date/php_datetimezone.c, ext/date/php_datetime.stub.php

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "\$dt = new DateTime(\"2026-05-29\", new DateTimeZone(\"UTC\")); echo \$dt->format(\"Y-m-d\");"'
# Expected: 2026-05-29

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

Closes #3072

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