This child bounty is for OpenSquare's retroactive work to implement the identity business on [statescan-v2](https://github.com/opensquare-network/statescan-v2). The work includes:
- Refactor the scan scripts submitted by [child bounty #245](https://kusama.subsquare.io/treasury/child-bounties/11_245). Check the PR [here](https://github.com/opensquare-network/statescan-v2/pull/691). The child bounty's work is fine, but to standardize the code style and improve some identity logic handling, we decide to refactor it.
- Add a graphql server which serve the identity business data. Code is [here](https://github.com/opensquare-network/statescan-v2/tree/main/backend/packages/identity-server), and we now are maintaining deployments for [kusama](https://kusama-identity-api.statescan.io/) and [polkadot](https://polkadot-identity-api.statescan.io/).
- Main PR is [here](https://github.com/opensquare-network/statescan-v2/pull/707/files), while there are also many small PRs. Fronted pages implementation, includes:
  1. A statistics panel about identities on [home page](https://kusama.statescan.io/). How many verified, unverified, erroneous identities we have in total, how many judgements, and how many registrars. 
  2. [Identities page](https://kusama.statescan.io/#/identities) where we can search identities by identity name or address.
  3. [Registrars page](https://kusama.statescan.io/#/identities/registrars?sort=REGISTRAR_TOTAL_EARN_DESC) where we can see statistics data about registrars.
  4. [Judgement requests page](https://kusama.statescan.io/#/identities/judgements) where we can see all history judgement requests and their status.
  5. We can see an account's timeline about identity. Check [Gav's page](https://kusama.statescan.io/#/accounts/FcxNWVy5RESDsErjwyZmPCW6Z8Y3fbfLzmou34YZTrbcraL?sub=identity_timeline&tab=identity) for an example.
  6. We can see a registrar's timeline data about history activities. Check [No.1 registrar's page](https://kusama.statescan.io/#/accounts/Fom9M5W6Kck1hNAiE2mDcZ67auUCiNTzLBUdQy4QnxHSxdn?sub=registrar_timeline&tab=identity) for an example.

Note the main reason we didn't create many small bounties to seek community hunters is the process will become very slow if we separate the implementations to many child bounties. The whole work cost OpenSquare team about 3 weeks with 3 FTE.


0x526574726f61637469766520776f726b20666f72206964656e74697479207363616e207265666163746f722c206772617068716c2073657276657220616e642066726f6e746564

- **Problem Statement:** Refactoring scan scripts and implementing identity business on statescan-v2 by OpenSquare.
- **Significance:** Enhancing code style, improving identity logic handling, and adding a graphql server for identity business data.
- **Proposed Solution:** Refactor scan scripts, add graphql server, and implement various frontend pages for identity statistics.
- **Expected Outcomes:** Improved code standardization, enhanced identity logic, and comprehensive identity data presentation on statescan-v2.

Requested: 0.81 undefined

#797 Retroactive work for identity fronted pages, scan refactor and graphql server implementation