feat(raft): add app

[tonzgao]

Description

https://discord.com/channels/647279669388771329/964569348243075082/1113848212923617291

Pujeet | Raft — Today at 2:42 AM
Thanks @tonz 

https://tempusfinance.notion.site/Integrate-Raft-with-Zapper-529705c597134fc2ac1e42a112e29c84

We want users to be able to check their collateral, borrowed R, current collateralization ratio, liquidation price and the current price. 

here's the link to all the contracts!

https://docs.raft.fi/contracts

Let us know if u need anything else 
Pujeet | Raft — Today at 10:15 AM
Let us know when you start @tonz 🙂
tonz — Today at 2:41 PM
starting
tonz — Today at 2:57 PM
is there a beta page for the ui or is it currently only contracts?
tonz — Today at 3:05 PM
also, i noticed that there is already a coingecko page for R at https://www.coingecko.com/en/coins/r. should the price returned by zapper for R be pulled from coingecko or be derived from the contracts somehow (such as the price feed)? nvm, assuming it will be basetoken 
tonz — Today at 3:26 PM
another question, is there a way to get all the currently available collaterals? I mean right now i know its just wsteth, but in the future i assume there will be others?
this can be through contract or through some api endpoint
tonz — Today at 4:56 PM
one more question, do you plan to do other stuff with the debt or collateral tokens, or are they only used to represent the loans?
Đorđe | Raft — Today at 5:15 PM
probably only via events, or by using SDK
Đorđe | Raft — Today at 5:15 PM
these tokens cannot be transferred, so answer is no

Checklist

• I have followed the Contributing Guidelines
• (optional) As a contributor, my Ethereum address/ENS is: tonygao.eth

How to test?

http://localhost:5001/apps/raft/balances?network=ethereum&addresses%5B%5D=0x6bddefb9f04b01c326b43b218059ee6938ea1ca8