refactor: improve selection bridge

[StevenEWright]

Gets rid of the remainder of the DOM management and now we have line metrics and line wrapping 🥳

In a follow up PR I will refactor gutters and highlights to handle #18 now that we have a source of truth for real line metrics.

**Github Issue List: ** closes #19

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[github-actions]

size-limit report 📦

Path	Size
./dist/kullna-editor.min.js	6.7 KB (-1.14% 🔽)