Statistics View - API and Usages

[lars-reimann]

Is your feature request related to a problem? Please describe

Currently, it's not possible to see statistics about the API and it's usages in the editor.

Desired solution

Create a new view that visualizes statistics about the API, it's usages, and the annotations.

Data about the size of the API

• Total number of API elements
  • Classes
  • Functions
  • Parameters
• Number of public API elements (see above)
• Number of used API elements (see above)
• Number of useful parameters (set to at least two different values)

This should be displayed as a labeled bar chart, similar to this:

It should be possible to set different thresholds, so it's for example possible to consider API elements used only if they are used at least 3 times.

Finally, the distribution of remaining classes, functions, and parameters should be shown for different thresholds in a line chart, with the threshold on the x-axis and the number of remaining API elements on the y-axis.

Additional context (optional)

• Blocked by Load usage data into editor #494.
• Relates to API Editor: Additional Filter commands #487.
• https://react-d3-library.github.io/ can be used to create the charts.

[lars-reimann]

Alternative charting library: https://github.com/reactchartjs/react-chartjs-2#docs