Markdown code highlight for Taipy visual elements

[FlorianJacta]

What would that feature address
The goal would be to make the experience of Taipy Gui more enjoyable and make it easier and user-friendly. Having a visual feedback on visual elements makes understanding the code far more effortless and enjoyable.

Example:

Acceptance Criteria

• Ensure new code is unit tested, and check code coverage is at least 90%
• Propagate any change on the demos and run all of them to ensure there is no breaking change
• Ensure any change is well documented

[FlorianJacta]

This was requested again by users

[jrobinAV]

Partly done by @dinhlongviolin1