Macro zkp_u256::self_ops_from_trait

macro_rules! self_ops_from_trait {
    (
        $type:ident,
        $op_trait:ident,
        $op_fn:ident,
        $trait:ident,
        $trait_fn:ident,
        $trait_assign_fn:ident
    ) => { ... };
}

Implement infix operator using OpInline trait, preferring _assign versions where possible.