test(barchart): add benchmarks

[Valentin271]

Adds benchmarks for the BarChart widget.

Relates to #137.

Here is the resulting graph.

[codecov]

Codecov Report

Merging #455 (16f11fa) into main (927a5d8) will decrease coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #455      +/-   ##
==========================================
- Coverage   90.03%   90.00%   -0.03%     
==========================================
  Files          40       40              
  Lines       11127    11156      +29     
==========================================
+ Hits        10018    10041      +23     
- Misses       1109     1115       +6     

see 2 files with indirect coverage changes

[karthago1]

thank you for the measurements, I always wondered how fast is the rendering.