Redo of "Add ability to add output prefixes to the REPL output and use that to implement an IPython mode"

[KristofferC]

Original PR (#46474) had to be reverted due to a change in a signature that happened after CI ran on that PR.

[PallHaraldsson]

Is it confusing (for the future) to call it an "IPython mode"?

Should it be "Jupyter mode" and module? That's what used in Julia, and IPython implementation detail, or is it even still used (or will forever)? If Jupyter is a better term, then change before 1.9 get released...

[KristofferC]

Should it be "Jupyter mode"

Why would it be called that?

[PallHaraldsson]

I'm not sure, I know about IPython and the history sort of. I thought Jupyter replaced IPython practically, for notebook users that would be what they know.

If this is only about numbered mode then maybe call it "Pluto mode" or just "numbered mode"?

[StefanKarpinski]

IPython still exists but is now a Python-specific REPL. This makes the Julia REPL a bit more like IPython.

[KristofferC]

I thought Jupyter replaced IPython practically,

https://github.com/ipython/ipython

If this is only about numbered mode then maybe call it "Pluto mode" or just "numbered mode"?

It is not, it is about being like IPython, hence "IPython mode" :).

[hyrodium]

@PallHaraldsson
I overlooked that there was already a discussion about the naming of this feature. I still think it's better to rename this feature, and opened a PR (#49314). Please comment in the PR if you have any thoughts on this.