Stdlib: vsprintf/vprintf Reflection names values (#23333)

[PurHur]

Summary

• Override BuiltinParamNames for vsprintf / vprintf so Reflection reports Zend stub names format,values (InternalArgInfo still says args)
• Named values: calls work; legacy args: is rejected
• php-src ref: ext/standard/basic_functions.stub.php

Lane C note: language/behavioral IR empty; claimed Reflection signature parity with lane-overflow note (STD Lib queue unclaimed). Prior pattern: #23308 / #31566.

Closes #23333

Test plan

• ./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/issue_23333_vsprintf_vprintf_reflection.php'
• ./script/phpunit.sh --filter 'Issue23333VsprintfVprintfReflectionTest|VsprintfVprintfReflection23333'

Verification output

vsprintf:format,values
vprintf:format,values
a-b
ok
Unknown named parameter $args
OK (4 tests, 8 assertions)

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