[solver-competition] Explorer: Show solver competition for a batch

[anxolin]

As a user of the explorer, I want to see the solver competitions for the batch So I

• Understand the details of the winning solution and what other solutions were submitted
• Understand how the winning solution dictated the price and the executed orders

Good to have:

• Understand a batch has uniform clearing prices
• Implement one page per solver

Additional details

Related to backend API proposal https://github.com/cowprotocol/services/issues/187

[elena-zh]

Some related tasks:

• https://github.com/cowprotocol/cowswap/issues/3720 (duplicate?)
• design? https://github.com/cowprotocol/cowswap/issues/3721