Low Performance in Series.Invalidate

[c0nstexpr]

I modified the initial collection count to 50k in the multithreading example.
Then I debug the project step by step and find out the loop in CoreLineSeries.Invalidate cost too much time:

LiveCharts2/src/LiveChartsCore/CoreLineSeries.cs

Line 182 in fc8320b

foreach (var segment in segments)

It takes 80~120 ms to finish one segment loop on my machine.