Stdlib: number_format() optional RoundingMode fifth parameter (#9438)

[PurHur]

Summary

• Accept PHP 8.4 optional 5th $rounding_mode (RoundingMode|int) on number_format() — previously rejected with ArgumentCountError.
• VM path resolves mode via VmRoundMode::resolveRoundModeArg() and applies VmRound::mathRound() in VmNumberFormat::format() (php-src ext/standard/number_format.c / shared _php_math_number_format_ex rounding).
• JIT/AOT lowering passes mode through JitRoundModeArg → extended __compiler_number_format ABI → SprintfJitHelper::numberFormat().

php-src reference

• ext/standard/number_format.c — 5-arg signature with RoundingMode|int
• ext/standard/math.c — _php_math_number_format_ex() / _php_math_round()

Verification

# Repro (PHP 8.4 profile)
PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_number_format_rounding_mode.php
# ok

# Docker compliance (VM + JIT)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && PHP_COMPILER_PROFILE=8.4 vendor/bin/phpunit test/compliance/VMTest.php --filter number_format_rounding_mode'
# OK (2 tests)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && PHP_COMPILER_PROFILE=8.4 vendor/bin/phpunit test/compliance/JITTest.php --filter number_format_rounding_mode'
# OK (2 tests)

vendor/bin/phpunit test/unit/StringFormatRuntimeShrinkTest.php
# OK (3 tests)

Note: Standalone AOT number_format link (__compiler_number_format) remains on deferred inventory stubs (#14811) — same pre-merge master behavior; AOT fixture added for when full StringFormat standalone bodies land.

Closes #9438

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