Implement hasattr builtin function

[friendlymatthew]

This PR implements hasattr(object,name) which returns True if the object has the named attribute, False otherwise. Unlike #65, this function never raises an AttributeError

This implementation calls py_get_attr() directly and converts the result to a boolean rather than reusing builtin_getattr(), since the functions have different signatures to validate

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing hasattr (873ee89) with main (7909646)}

Summary

✅ 11 untouched benchmarks