Stdlib: stream_filter_append/prepend Reflection Zend names (#28908)

[PurHur]

Summary

• Fix stream_filter_append / stream_filter_prepend Reflection param names to Zend filter_name / mode / params (was filtername / read_write / filterparams).
• Clear bogus resource return type (php-src stubs leave return untyped).
• Accept named filter_name: / mode: / params:.
• PHP-in-PHP only (BuiltinParamNames + BuiltinInternalArgInfo + TypeError labels).

Closes #28908

Test plan

• php bin/vm.php test/repro/issue_28908_stream_filter_append_reflection.php
• vendor/bin/phpunit --filter "StreamFilterAppendPrependReflectionVMTest|testStreamFilterAppendPrependZendStubNamedParamsAndReturn"

Verification transcript

$ php bin/vm.php test/repro/issue_28908_stream_filter_append_reflection.php
stream_filter_append [stream, filter_name, mode, params] ret=(none)
stream_filter_prepend [stream, filter_name, mode, params] ret=(none)
named_ok

$ vendor/bin/phpunit --filter "StreamFilterAppendPrependReflectionVMTest|testStreamFilterAppendPrependZendStubNamedParamsAndReturn"
OK (2 tests, 19 assertions)

php-src ref: ext/standard/basic_functions.stub.php. Not covered: full ci-fast.sh / AOT.

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