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

[chimp1984]

> Yes, I think I recall the methods being a significant hotspot, when profiling the UI a while ago, so even small absolute speedups are probably worthwhile. The updated changes in the PR look fine to me.
> 
> utACK

Yes, they are relatively easy and low risk, thats why I started on that beside other more complex ones like in the DAO domain...
A big part are item renderers not caching data but using viewModels as in offerBook. Will work on that as well but thats much more effort...

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