Feature/code editor (#607)

* create component

* import styles correctly

* import component

* show code editor element on the template workspace

* wire input event

* sync code property with editor value

* move workers to a separate file

* create class for code editor

* add very simple insert method

* focus after insert

* make scroll bar bit nicer

* add markdown example and fancier template

* make insert work with multiple cursors and selections

* now really make it works with selections and multiple cursors

* map options

* add hack to fix the jumpy cursor

* Observe themes

* add own model for range, return array of ranges from find

* add backoffice-fit dark mode

* add theme story

* add themes folder

* add new methods

insertAtPosition
getValueInRange
select

* add documentation to editor class

* add docs

* rename file

* rename donut files

* cleanup

* add some more imports

* test heap size fix

* heap error test 2

* fix imports

* node fail error test

* rename

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Co-authored-by: Mads Rasmussen <madsr@hey.com>

src/Umbraco.Web.UI.Client/.github/workflows/build_test.yml

@@ -15,6 +15,9 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
+env:
+  NODE_OPTIONS: --max_old_space_size=16384  
+
 jobs:
   build: