feat: Incremental Accessibility Tree

[marc2332]

Closes #825

[codecov]

Codecov Report

Attention: Patch coverage is 58.57143% with 174 lines in your changes missing coverage. Please review.

Project coverage is 75.95%. Comparing base (630a579) to head (468b647).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/renderer/src/accessibility.rs	0.00%	78 Missing ⚠️
crates/core/src/accessibility/tree.rs	74.87%	51 Missing ⚠️
crates/renderer/src/app.rs	0.00%	29 Missing ⚠️
crates/renderer/src/renderer.rs	0.00%	7 Missing ⚠️
crates/testing/src/test_handler.rs	79.16%	5 Missing ⚠️
crates/common/src/accessibility.rs	60.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #853    +/-   ##
========================================
  Coverage   75.94%   75.95%            
========================================
  Files         202      203     +1     
  Lines       22760    22899   +139     
========================================
+ Hits        17286    17392   +106     
- Misses       5474     5507    +33     

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