feat: enhance image and path in renderer and optimize middleare ruler

[chenshenhai]

• feat(renderer): add scaleMode to enhance image of renderer
• feat(renderer): add fillRule to enhance path of renderer
• feat(core): optimize grid render of ruler middleware
• refactor: rename helperContext and underContext to overlayContext and underlayContext

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 119 lines in your changes are missing coverage. Please review.

Project coverage is 7.40%. Comparing base (75eb760) to head (809c704).
Report is 115 commits behind head on main.

Files	Patch %	Lines
packages/renderer/src/draw/image.ts	0.00%	30 Missing and 7 partials ⚠️
packages/core/src/middleware/ruler/util.ts	0.00%	14 Missing and 4 partials ⚠️
packages/util/src/lib/canvas.ts	0.00%	18 Missing ⚠️
packages/core/src/middleware/selector/index.ts	0.00%	12 Missing ⚠️
packages/core/src/middleware/ruler/index.ts	0.00%	8 Missing and 1 partial ⚠️
packages/board/src/index.ts	0.00%	5 Missing ⚠️
packages/board/src/lib/viewer.ts	0.00%	5 Missing ⚠️
packages/core/src/middleware/info/index.ts	0.00%	4 Missing ⚠️
packages/core/src/middleware/scroller/util.ts	0.00%	2 Missing and 2 partials ⚠️
packages/core/src/middleware/scroller/index.ts	0.00%	3 Missing ⚠️
... and 2 more

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Additional details and impacted files

@@           Coverage Diff            @@
##            main    #316      +/-   ##
========================================
- Coverage   7.46%   7.40%   -0.07%     
========================================
  Files         92      92              
  Lines       5893    5944      +51     
  Branches    1120    1131      +11     
========================================
  Hits         440     440              
- Misses      4388    4428      +40     
- Partials    1065    1076      +11     

Flag	Coverage Δ
unittests	7.40% <0.00%> (-0.07%)	⬇️

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