feat: allow type-narrowing of nodes based on type_name

[bartveneman]

closes #229

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 1.55kB (0.83%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@projectwallace/css-parser-esm	187.05kB	1.55kB (0.83%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: @projectwallace/css-parser-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
node-types-mntWKkN-.d.ts (New)	25.17kB	25.17kB	100.0% 🚀
node-types-DJytj0FB.d.ts (Deleted)	-23.63kB	0 bytes	-100.0% 🗑️

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.86%. Comparing base (ba3c31e) to head (366f397).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   93.86%   93.86%           
=======================================
  Files          17       17           
  Lines        2965     2965           
  Branches      808      808           
=======================================
  Hits         2783     2783           
  Misses        182      182           

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