feat(adapters): caret adapter basic implementation

[neSpecc]

Basic implementation of the Caret DOM Adapter

• Binds "selectionchange" event on document using "useSelectionChange" util providing "on" and "off" methods.
• "useSelectionChange" creates a singleton and delegates listeners
• Caret Adapter provides attachInput and detachInput methods
• Caret Adapter extends EventTarget and emits the change event — used for playground purposes. Could be removed later
• Playground contains Input components with Caret Adapter attached. Caret index is displayed at the right side of the input

[github-actions[bot]]

✅ Mutation testing passed

Report: https://dashboard.stryker-mutator.io/reports/github.com/editor-js/document-model/PR-58

Mutated files

src/utils/EventBus/index.ts
src/utils/index.ts
src/index.ts
  

[github-actions[bot]]

Coverage report for ./packages/model

St.:grey_question:	Category	Percentage	Covered / Total
🟢	Statements	100%	589/589
🟢	Branches	99.27%	136/137
🟢	Functions	99.33%	149/150
🟢	Lines	100%	564/564

Test suite run success

347 tests passing in 20 suites.

Report generated by 🧪jest coverage report action from 4c73832c70e3b3aa8400be1c8ea8a42264b50d84