Add at least one more price source to ASB

[darkness-su]

Currently only Kraken's price API is compatible with ASB. This creates an attack surface as price manipulation at quote time on the corresponding Kraken pair could be used to exploit makers for a large amount.

See the following article where such manipulation was used on Coinbase to exploit major DeFi protocol Compound:
https://rekt.news/coinbase-the-oracle/

This would likely be unprofitable for now due to the amount of available liquidity, but would likely become a problem later.

It would be best to aggregate multiple sources and calculate an average to prevent such events.

Other websocket sources:

• Binance Futures
• Bybit Futures
• Kucoin (spot and/or futures)