feat: improve renderer and middleware

[chenshenhai]

• feat(renderer): improve renderer for rect, path and group
• feat(core): add event for controlling snapToGrid in selector middleware
• feat(idraw): add feature of controlling snapToGrid

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 43 lines in your changes missing coverage. Please review.

Project coverage is 6.54%. Comparing base (6786f97) to head (ac60ce4).
Report is 121 commits behind head on main.

Files	Patch %	Lines
packages/core/src/middleware/selector/index.ts	0.00%	16 Missing and 6 partials ⚠️
packages/renderer/src/draw/path.ts	0.00%	10 Missing and 3 partials ⚠️
packages/core/src/middleware/selector/config.ts	0.00%	3 Missing ⚠️
packages/idraw/src/idraw.ts	0.00%	1 Missing and 1 partial ⚠️
packages/renderer/src/draw/group.ts	0.00%	1 Missing and 1 partial ⚠️
packages/renderer/src/draw/rect.ts	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##            main    #323      +/-   ##
========================================
- Coverage   6.56%   6.54%   -0.03%     
========================================
  Files        105     105              
  Lines       6716    6742      +26     
  Branches    1308    1315       +7     
========================================
  Hits         441     441              
- Misses      5022    5041      +19     
- Partials    1253    1260       +7     

Flag	Coverage Δ
unittests	6.54% <0.00%> (-0.03%)	⬇️

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