Track transform for bboxes separately from the canvas

[nicolo-ribaudo]

This patch works towards the goal of being able to track bboxes without doing a full render. The remaining bbox tracking that relies on the canvas is for text metrics.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 41.12903% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.24%. Comparing base (a55cec4) to head (a320efd).

Files with missing lines	Patch %	Lines
src/display/canvas_dependency_tracker.js	38.09%	39 Missing ⚠️
src/display/canvas.js	30.61%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20855      +/-   ##
==========================================
- Coverage   55.97%   55.24%   -0.73%     
==========================================
  Files         218      218              
  Lines       59033    59123      +90     
==========================================
- Hits        33041    32665     -376     
- Misses      25992    26458     +466     

Flag	Coverage Δ
fonttest	8.66% <0.00%> (-0.01%)	⬇️
unittest	55.19% <41.12%> (-0.04%)	⬇️
unittestcli	?

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[Snuffleupagus]

Is this method no longer used, given the other changes in this patch?
If so, please remove it to avoid shipping dead code in the builds.