Register file_get_contents() filename: named parameter (Closes #10045)

[PurHur]

Summary

• Register file_get_contents parameter names in BuiltinParamNames (filename, use_include_path, context, offset, length) so compile-time named-argument binding matches php-src.
• Add VM/JIT compliance guards and a maintainer repro script.

php-src reference

• ext/standard/basic_functions.stub.php — file_get_contents() parameter names

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/named_file_get_contents.php
php bin/vm.php test/repro/named_file_get_contents.php
vendor/bin/phpunit --filter file_get_contents_filename_named
vendor/bin/phpunit test/unit/BuiltinParamNamesAliasTest.php --filter testFileGetContentsFilenameNamedParameter
'

Output:

'hello readfile
'
'hello readfile
'
OK (4 tests, 4 assertions)
OK (1 test, 4 assertions)

Closes #10045

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