Initial Shaft render backend impl

[xtyxtyx]

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[codecov]

Codecov Report

❌ Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.34%. Comparing base (0b68746) to head (f276b1e).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...re/Render/DisplayList/DisplayListViewUpdater.swift	0.00%	6 Missing ⚠️
...e/Render/DisplayList/DisplayListViewRenderer.swift	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #638      +/-   ##
==========================================
+ Coverage   30.24%   30.34%   +0.09%     
==========================================
  Files         552      549       -3     
  Lines       32970    32582     -388     
==========================================
- Hits         9973     9886      -87     
+ Misses      22997    22696     -301     

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