Subscan feature wishlist

Subscan is our block explorer that has recently been deployed (https://joystream.subscan.io). It has a very basic implementation currently but their team will be sharing some details about how we might be able to customize it.

This issue is just to capture features and improvements that people might want to see.

## Wishlist
1. The ability to see `locks` that are applied to an account.
* Our account system is very unique and sometimes users cannot do actions because of locks on accounts. The only way to currently diagnose this is to use polkadot-js with a very tedious query (`balances.locks`) to see current locks.
* The solution here would be to have the UI show what locks are currently applied to an account.
2. Recognize WG worker + lead reward payments as well as council payments
* A user should be able to query an account address and see these payments as incoming transactions, they are currently not shown (although the balance of the account is correct)
3. Recognize discretionary payments + show rationale + associated WG
4. Recognize `funding proposal` transactions
5. Have `inflation` value take into account council spending + WG rewards etc
6. Add a stats page that shows things like total memberships, videos, channels, proposals etc
7. Surface transactions contained within `batch` transactions