[Tech]: Optimize expiration unscheduling

[bragov4ik]

Problem statement

We would like to improve performance of the order-book pallet in order to raise ceilings for parameters. It should allow higher number of prices, orders within an orderbook, making it more usable

Description

• This benchmark run has shown that increasing max_expiring_orders_per_block parameter drastically slows down the execution.
• Such effect is quite unexpected

Definition of Done

• [ ] The reasons for the slow down were investigated and discovered
• [ ] The implementation is improved, where applicable and possible.
• [ ] The results are confirmed with benchmark runs

Requirements

No response