[bisq-network/bisq] Offer Book chart outlier filter improved. (#4892)

[deusmax]

Outlier data filter used for the Market Offer Book chart, now accounts
for the switching display position of Buy, Sell data depending on
currency type (Crypto or Fiat).

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Fixes #4871  

Some of the Market Offers have values far from the main trading body (outliers). Including these points in a chart destroys any significant and useful information presented in the graph. An outlier filter, applied during the production of these charts, is used to remove such points. 

The implementation of this filter did not take into account the chart differences between fiat and crypto currencies. The one in this PR does.
The recently increasing Fiat value of BTC, coupled with extreme outlier values, has exposed the limitations. This PR provides a filter that gives better results and should be much more stable. 

See issue #4871 for before & after screenshots.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4892

-- Commit Summary --

  * Offer Book chart outlier filter improved.

-- File Changes --

    M desktop/src/main/java/bisq/desktop/main/market/offerbook/OfferBookChartView.java (96)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4892.patch
https://github.com/bisq-network/bisq/pull/4892.diff

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