Auction data for Validators in a single RPC response

Problem Statement:
Currently, querying auction-related data requires making separate calls for each bid, which is highly inefficient when managing a large number of bids. This inefficiency complicates workflows for developers and hinders network transparency. Additionally, without a streamlined method or a network explorer like CSPR.live, it becomes challenging to self-discover this critical information, impeding the development of tools and features like liquid staking.

User Story based on the requirement: (as outlined by MAKE Services team to Jakub in a chat);
As a: Blockchain Developer
I want to: retrieve detailed auction-related information for all bids in a single RPC response
So that I can: improve the efficiency of bid queries and enhance network transparency for developers and stakeholders.

Estimated benefits:

- This improvement aligns with ongoing efforts to implement liquid staking and other staking-related features.
- It supports developers in building robust solutions that leverage Casper Network's validator data.

No files, tests, or entry points are named. Start by tracing the existing auction-related RPC calls and bid data structures, then define the response shape and scope for all bids. Done means one RPC response exposes the detailed auction information needed by blockchain developers.

Written by the indexing model from the issue text.