convert smc_custom_proposal to genstudio (GEN-233)

[mhuebert]

@MathieuHuot

• I converted the doc to a .py file (LMK if that's ok, I can also convert back to .ipynb).
• For performance reasons I am saving the logo as an image, and using that in the studio plot using a new Plot.img mark. (Turns out the Observable Plot raster mark is much slower, takes 500ms to render pixels from data.)
• I converted the logo to an outline so that dots inside/outside are equally visible.
• requires the latest genstudio version (so be sure to poetry install)

Screen.Recording.2024-09-27.at.5.43.58.PM.mov

[linear]

GEN-233 Gen-Studio Visualization for SMC

huebert and mhuot to pair on adding gen-studio to a cookbook page on SMC.

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[MathieuHuot]

This is great @mhuebert, and I think we can merge this version on my branch.
I will continue to develop the project to get to the point I wanted with rejuvenation and different strategies, and then we'll be able to try interactive inference!

[MathieuHuot]

@mhuebert I notice you still haven't merged this.
I the mean time I rewrote most of the code to make it cleaner and actually work (there were a few math bugs, now it's fixed but SMC looks worse for some reason). I rewrote the jupyter notebook version though, it's what I'm more used to for running cells and debugging.

[mhuebert]

@MathieuHuot I've revised this PR:

• changes are applied directly to the .ipynb file
• I introduced a dots_plot helper fn
  The only thing I'm not sure about are the correct image paths.