[stable8] feat(NcReferenceWidget): allow to enable resizable widget height

[mejo-]

☑️ Resolves

Allows widgets to flag themselves as resizable, which adds a resize drag handle to resize them horizontally. Particularly useful for embedded office documents, tables and deck boards in a Text file.

Required to fix nextcloud/text#8279

Developed against stable8 on purpose as Text and Deck apps are still on Vue 2, but already forward-ported locally to main branch.

Intending to set isResizable: true at least in files and deck board widget for a starter.

🖼️ Screencasts

🏡 After

🏁 Checklist

• [] ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.70%. Comparing base (488cb5a) to head (8160e7f).

Files with missing lines	Patch %	Lines
src/components/NcRichText/NcReferenceWidget.vue	0.00%	6 Missing ⚠️
src/functions/reference/widgets.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           stable8    #8665      +/-   ##
===========================================
- Coverage    46.85%   46.70%   -0.16%     
===========================================
  Files          195      195              
  Lines         4926     4944      +18     
  Branches      1268     1273       +5     
===========================================
+ Hits          2308     2309       +1     
- Misses        2529     2546      +17     
  Partials        89       89              

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[ShGKme]

Tested on Windows Vivaldi and Android Firefox, works and looks well with mouse, finger, keyboard and screen reader.

[susnux]

/backport to main