core: Onchain Price Fetching & Registry observing

[pajicf]

What does this PR resolve? 🚀

• Refresh prices every 1min from Coingecko
• Listener to watch for tickers
• Store tickers to storage
• Store prices to storage

Details 📝

New libraries

• We'll be using Redux for in-memory storage management on the project
• Ethers for web3 interactions

General

This PR implements price fetching from an off-chain centralised actor and has a cron job setup that occurs every 1 minute.
The data on which tickers to query is obtained from the Registry contract.
After obtained, a listener is setup to observe any future changes in the registry and update the application state.

Based on the app state of tickers, the CoinGecko cron job is ran recurrently.

Checklist ✅

• I've read Contributions section in the README.md document
• I have merged the main branch into my branch and resolved all conflicts
• I have documented the new code
• I have created automated tests for the new code
• I have smoke tested the new code locally
• I have assigned the PR to myself
• I have named the PR correctly