PriceNode: exclude currencies via config

[ghost]

This allows the PriceNode to configure certain currencies as not quoted, i.e. will not be delivered in its service API. By doing so, those markets can self-discover the price the same way as is already done in BSQ/BTC market.

Fixes #5581

Config

Added to application.properties

bisq.price.fiatcurrency.excluded=LBP,ARS
bisq.price.cryptocurrency.excluded=

Code changes:

• get Environment object from Spring framework.
• parse & validate any currencies specified in the application.properties file.
• exclude currencies from the exchange supported fiat currency / crypto currency lists.
• log details of currencies excluded via configuration.
• add tests for the above.

[ripcurlx]

@jmacxx It does work as described on RegTest, but what is the difference to using fixed price right now already?

Current state:

Filtered out state:

So the only difference is that as a user I have the price of the last trade as indicator what someone was willing to pay.

[ghost]

When a market is quoted by a price feed, users are limited to trading at prices within 50% of the reference quote. If we disable the quote for LBP & ARS the user can trade using the street price.

[ripcurlx]

ACK - Tested it on Regtest. The changes for these market should be coordinated with @pazza83 I guess.

[pazza83]

I will test it with the new release. I also think it is worth promoting to potential users in these markets.