refactor: Split core render functions

[marc2332]

No description provided.

[marc2332]

wip

[codecov]

Codecov Report

Attention: Patch coverage is 47.41573% with 234 lines in your changes missing coverage. Please review.

Project coverage is 75.20%. Comparing base (0cb934f) to head (d502b34).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/render/utils/paragraph.rs	32.88%	100 Missing ⚠️
crates/core/src/render/utils/borders.rs	70.21%	56 Missing ⚠️
crates/core/src/render/utils/shadows.rs	0.00%	50 Missing ⚠️
crates/state/src/values/fill.rs	0.00%	15 Missing ⚠️
crates/core/src/elements/rect.rs	8.33%	11 Missing ⚠️
crates/core/src/render/utils/label.rs	93.54%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #937      +/-   ##
==========================================
- Coverage   75.23%   75.20%   -0.03%     
==========================================
  Files         208      212       +4     
  Lines       24214    24223       +9     
==========================================
  Hits        18218    18218              
- Misses       5996     6005       +9     

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