[bisq-network/bisq] PriceNode: Add support for multiple ExchangeRateProviders (#4315)

[cd2357]

Thanks @wiz and @sqrrm.

You're both raising a good point: the queston of which currencies are supported (and which are lost) with this PR. Ideally, we don't want to lose any currency, and especially not the actively traded ones.

Fortunately, I found some promising solutions for that (thx @wiz for the [BTCPay link](https://twitter.com/BtcpayServer/status/1216665745951576065)).

I'll mark the PR as a draft for now, until I integrate this and update the tests.

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