Add font-weight attribute for item label font

[igorwessel]

This pull request introduces the itemLabelFontWeight property to the Wheel class, allowing users to specify the font weight for item labels.

Enhancements to Wheel class:

• src/wheel.js: Added itemLabelFontWeight property, including getter and setter methods, and updated the ctx.font assignment to incorporate the new property. [1] [2] [3]

Updates to default constants:

• src/constants.js: Added itemLabelFontWeight to the Defaults object with an initial value of an empty string.

Playground updates:

• examples/playground/index.html: Added a new input group for itemLabelFontWeight.

Evidences

https://github.com/user-attachments/assets/0e2093e9-de6f-4fd0-982b-fb30d9ef2e06

[igorwessel]

ps @CrazyTim

[CrazyTim]

@igorwessel nice PR, thanks for this.

Sorry for the late reply, I had some ideas about extending this but never got around to it 😆 I'll try and have another look soon.