Optimize properties_set to clone once instead of per property

[veewee]

Summary

properties_set() previously called property_set() per property, which cloned the object on every call. For an object with N properties, that's N clones and N ReflectedClass::fromObject() lookups.

Now clones once and sets all properties on the single clone directly using ReflectionProperty::setValue(). Dynamic properties (stdClass, AllowDynamicProperties) are handled via direct property assignment as a fallback.

Impact

For an object with 9 properties, properties_set cost drops from ~10us to ~5.5us (~45% faster). Measured in the php-soap/encoding benchmark suite where this is on the decode hot path.

Changes

• Clone once at the start instead of per property
• Iterate values and set via ReflectionProperty::setValue() directly
• Handle dynamic properties inline (same behavior as property_set)
• Empty values short-circuit (return original object)

Test plan

• Full test suite passes (119 tests)
• Psalm clean
• CS fixer clean
• Benchmarked in php-soap/encoding: -4% to -9% decode improvement