eIP 18: Move all asset price oracles to Chainlink where available ahead of the Merge

@seraphim I am not skeptical of this proposal, but i will abstain from voting

My reason for this is an NZDS/USDC Pool Incident that happened a while ago on DFX Finance due to the Chainlink price oracle fault. You can read about it here in this medium article: NZDS/USDC Pool Post Mortem. Website | Twitter | Telegram | Discord… | by DFX Finance | Medium

In short…

During the weekend of July 01 to July 03, the NZDS minor price movements occurred at regular intervals on DFX. The prices provided to the protocol by Chainlink had a small range between 0.61 (0.612755) and 0.62 (0.620340).

It would be wrong if, one day, some other asset out of the blue would start to provide incorrect prices that would cause liquidations for no reason.

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