Add option to chart trade statistics in terms of number of trades

[cbeams]

This is a follow on to the feature released in v1.5.5 that allow charting USD-denominated trade volumes (#5066).

Ideally, we would allow three options for charting trade statistics:

1. Trade volume in BTC (current default)
2. Trade volume in USD (new option in v1.5.5)
3. Number of trades (proposed new option)

I tweeted about this at https://twitter.com/cbeams/status/1357298837052866560, here's a screenshot:

The graph shown in the lower tweet is available at https://docs.google.com/spreadsheets/d/1o-I5fAx7DJRVqYjW8fPbo0ztlGIhIZ1EM2iLc5aEHnA/edit#gid=86481090 (not currently publicly available)

I see the number of trades per month as one of Bisq's best health metrics. It keeps growing, it's a positive story, and it's a missed opportunity not to show this more prominently to users.

This could be implemented by offer three radio buttons above the chart instead of a toggle slider, e.g.:

[ ] Show volume in BTC [ ] Show volume in USD [x] Show number of trades

[chimp1984]

I will soon have a PR with an improved chart component. So maybe worth to wait for that and use that then as base to extend the feature... Any dev welcome to pick that up...

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