[EASY] Fix ceil_div in scoring (#2566)

# Description
Fixes #2555

[Previously](#2464) we fixed
the ceil_div in SettlementEncoder, however the similar fix is needed in
scoring module.

## How to test
Added temporary unit tests just to prove the fix is right. 

8ec61b2

Two multiplication unit tests prove that there is a difference in the
sell price => difference between `21487` and `21488` when using the
problematic settlement.

Then, added scoring test for the problematic settlement which proves
that this difference causes the final score difference
`66264322342847212` and `66309509871089417`.

crates/driver/src/domain/competition/solution/mod.rs

@@ -13,6 +13,7 @@ use {
             solver::Solver,
             Simulator,
         },
+        util::conv::u256::U256Ext,
     },
     futures::future::try_join_all,
     itertools::Itertools,
@@ -156,7 +157,7 @@ impl Solution {
                         .0
                         .checked_mul(uniform_prices.sell)
                         .ok_or(error::Math::Overflow)?
-                        .checked_div(uniform_prices.buy)
+                        .checked_ceil_div(&uniform_prices.buy)
                         .ok_or(error::Math::DivisionByZero)?,
                     order::Side::Buy => trade.executed().0,
                 },