feat: Add loader

[JulienDeveaux]

Implements #344 using this style of loader : https://raw.githubusercontent.com/n3r4zzurr0/svg-spinners/main/preview/pulse-black-36.svg

[ildar170975]

@akloeckner
Can you have a look now?
We added a small fix related to css. In other things I am not 100% confident, we need to test )))

If OK - then please as usual:

• generate js
• we will test it together
• create Release if OK

[JulienDeveaux]

I've removed an extra check and the feeling of the loader is better and more consistent

[JulienDeveaux]

I'm changed the loader from the pulsating circle to this pulsating graph :

I think the circle wasn't good enough as it wasn't showing a graph
Tell me what you think, I'll roll back it if necessary

[akloeckner]

I took the liberty to restart the minor cleanups in separate comments. I felt, it became a bit mixed up in the one long conversation we're having.

[akloeckner]

😆 Nice commit title...

From the theoretical standpoint, this PR looks really great to me now. I'll download and test it again in the coming days.

[ildar170975]

Seems great.
I would even suggest to merge it)))

[ildar170975]

@JulienDeveaux
@akloeckner
Really enjoyed working together.

[akloeckner]

I would even suggest to merge it)))

Did you test it? I would then trust you and merge it.

[ildar170975]

Did you test it?

Yeah, a little))))) Will not cause a nuclear war I hope.
Progress indicator is displayed fine.

[akloeckner]

Thanks, guys. This was really a productive night!

[github-actions]

🎉 This PR is included in version 0.13.0-dev.1 🎉

The release is available on GitHub release

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