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

[cd2357]

I added more exchange rate providers, see the PR description for full table of supported currencies.

Looking at the active fiat markets right now, it seems they're all covered by this PR:

```
ARS=[BITPAY, COINGECKO, COINPAPRIKA]
AUD=[BITPAY, BTCMARKETS, COINGECKO, COINPAPRIKA, IndependentReserve, KRAKEN, QUOINE]
BRL=[BITPAY, COINGECKO, COINPAPRIKA, MercadoBitcoin]
CAD=[BITPAY, COINGECKO, COINPAPRIKA, KRAKEN]
CHF=[BITPAY, COINGECKO, COINPAPRIKA, KRAKEN]
CLP=[BITPAY, COINGECKO, COINPAPRIKA]
CNY=[BITPAY, COINGECKO, COINPAPRIKA]
DKK=[BITPAY, COINGECKO, COINPAPRIKA]
EUR=[BITPAY, BINANCE, BITSTAMP, BITBAY, BITFINEX, CexIO, COINGECKO, Coinmate, COINPAPRIKA, EXMO, KRAKEN, QUOINE]
GBP=[BITPAY, BINANCE, BITSTAMP, BITBAY, BITFINEX, CexIO, COINGECKO, COINPAPRIKA, KRAKEN]
HUF=[BITPAY, COINGECKO, COINPAPRIKA]
JPY=[BITPAY, BITFINEX, BITFLYER, COINGECKO, COINPAPRIKA, KRAKEN, QUOINE]
NOK=[BITPAY, COINGECKO, COINPAPRIKA]
NZD=[BITPAY, COINGECKO, COINPAPRIKA, IndependentReserve]
PHP=[BITPAY, COINGECKO, COINPAPRIKA]
PLN=[BITPAY, BITBAY, COINGECKO, COINPAPRIKA, EXMO]
RON=[BITPAY]
RUB=[BITPAY, BINANCE, CexIO, COINGECKO, COINPAPRIKA, EXMO]
SEK=[BITPAY, COINGECKO, COINPAPRIKA]
SGD=[BITPAY, COINGECKO, COINPAPRIKA, QUOINE]
USD=[BITPAY, BITSTAMP, BITBAY, BITFINEX, CexIO, COINGECKO, COINPAPRIKA, EXMO, IndependentReserve, KRAKEN, QUOINE]
THB=[BITPAY, COINGECKO, COINPAPRIKA]
ZAR=[BITPAY, BINANCE, COINGECKO, COINPAPRIKA, LUNO]
```

Looking at the active alts markets, some of them are covered:

```
DASH=[BINANCE, BITBAY, CexIO, Coinmate, EXMO, HITBTC, HUOBI, KRAKEN, POLO]
DCR=[BINANCE, HITBTC, HUOBI, POLO]
ETC=[BINANCE, BITFINEX, EXMO, HITBTC, HUOBI, KRAKEN, POLO]
ETH=[BITPAY, BINANCE, BITSTAMP, BITBAY, BITFINEX, BITFLYER, BTCMARKETS, CexIO, COINGECKO, Coinmate, EXMO, HITBTC, HUOBI, KRAKEN, POLO, QUOINE]
FAIR=[HUOBI]
LTC=[BINANCE, BITSTAMP, BITBAY, BITFINEX, BTCMARKETS, CexIO, COINGECKO, Coinmate, EXMO, HITBTC, HUOBI, KRAKEN, POLO]
XMR=[BINANCE, BITFINEX, EXMO, HITBTC, HUOBI, KRAKEN, POLO]
XRC=[HITBTC]
ZEC=[BINANCE, BITFINEX, EXMO, HITBTC, HUOBI, KRAKEN, POLO]
```

others not so much, like `NMC`, `CLP`, `SIL`, `L-BTC` and `SF`.

---

How do you guys see this?

Looking at Tables 1 and 2 for the full lists, are there any currencies which are not supported, but which should be?


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