Add HarmonyOS Sans font and implement QuickUI for text handling

- Imported HarmonyOS Sans Regular font with appropriate settings for rendering and fallback.
- Created QuickUI script to facilitate the creation of small text labels with optional centering.
- Added new theme resources for big bold text and small text, defining font sizes for RichTextLabel and Label respectively.

themes/bigTextAndBold.tres

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+[gd_resource type="Theme" format=3 uid="uid://bje5cd08dyok7"]
+
+[resource]
+RichTextLabel/font_sizes/bold_font_size = 18

themes/smallText.tres

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+[gd_resource type="Theme" format=3 uid="uid://b6nox1qqh50ub"]
+
+[resource]
+Label/font_sizes/font_size = 13