Allow custom Javascript files

[ShootingStarD]

Description

Currently we can use the Extension API to import javascript components in a Taipy app. However it could also be useful to import JS files in a taipy project, like Dash can do, for example to add certain animations on the page or other things like that.

I think it would also be good for prototyping before making a real compenent via the Extensions API

Solution Proposed

I imagine that we can add an argument in the GUI constructor so that we can add a list of javascript files that will be loaded in the header of html pages generated by the Taipy App

Impact of Solution

NA

Additional Context

While the feature is not really urgent or anything, I thing it is a good add-on for Taipy to become "as easy to use as streamlit, and as customizable as Dash"

Acceptance Criteria

• Ensure new code is unit tested, and check code coverage is at least 90%.
• Create related issue in taipy-doc for documentation and Release Notes.
• Check if a new demo could be provided based on this, or if legacy demos could be benefit from it.
• Ensure any change is well documented.

Code of Conduct

• I have checked the existing issues.
• I am willing to work on this issue (optional)