[bisq-network/bisq] Cache results of isFiatCurrency and isCryptoCurrency (#4955)

[sqrrm]

@sqrrm approved this pull request.

utACK on the changes

> @@ -62,6 +62,14 @@ public static void setup() {
 
     private static String baseCurrencyCode = "BTC";
 
+    // Calls to isFiatCurrency and isCryptoCurrency are very frequent so we use a cache of the results.
+    // The main improvement was already achieved with using memoize for the source maps, but
+    // the caching still improves performance by about 20% for isCryptoCurrency and about 100%

100% improvement sounds wrong, 10%?

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