Stdlib: debug_zval_dump() stream resource — resource() line (#18419)

[PurHur]

Summary

• Route debug_zval_dump() through VmVarFormat::tryFormatDebugZvalDump() so stream handles print resource(id) of type (stream) refcount(n) like Zend/var_dump(), instead of object(Resource)#….
• Add repro + compliance guard for open and closed php://memory streams.

Root cause

VmDebugZval lacked the resource branch that VmVarDump already shares via VmVarFormat.

php-src reference

• ext/standard/var.c — zval_dump / debug_zval_dump
• Zend/zend.c — zend_dump_var

Verification

php bin/vm.php test/repro/maintainer_gap_debug_zval_dump_stream.php
# resource(4) of type (stream) refcount(3)
# resource(4) of type (Unknown) refcount(3)

php bin/vm.php -r '$h=fopen("php://memory","r+"); debug_zval_dump($h);'
# resource(N) of type (stream) refcount(2)

./script/phpunit.sh --filter debug_zval_dump_stream
# OK (2 tests)

./script/phpunit.sh --filter 'debug_zval_dump_refcount|debug_zval_dump_string'
# compliance VM tests OK; AOT debug_zval_dump_string pre-existing fail on master (exit 134)

Closes #18419

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