Check if latest go-eth2-client PR fixes /validators performance issues

[boulder225]

🎯 Problem to be solved

The /validators endpoint in our system is experiencing slow performance, causing user issues. A recent pull request in the go-eth2-client library might fix the performance issues. We need to evaluate the PR and determine if it indeed resolves the slow performance of the /validators endpoint.

🛠️ Proposed solution

• Review the go-eth2-client pull request (Use POST to obtain validator data. attestantio/go-eth2-client#146) in detail.
• Analyze the changes made in the PR and understand how they potentially address the performance issues.
• Perform comprehensive performance tests on the /validators endpoint using the updated go-eth2-client library.