Add formatter for lets-plot figures.

[alshan]

📝 Summary

Register formatters for 'plot' objects produced by the Lets-Plot plotting library: https://lets-plot.org

🔍 Description of Changes

Added LetsPlotFormatter class (marimo/_output/formatters/lets_plot_formatters.py) implementing formatters associated with the 'lets_plot' package.

Demo code:

import numpy as np
from lets_plot import ggplot, geom_point, aes, gggrid, ggsize, geom_livemap

x = np.random.rand(100)
y = 2 * x + 1 + np.random.normal(0, 0.1, 100)

data = dict(x = x, y = y)

p = ggplot(data) + geom_point(aes('x', 'y'))
p
---------

gggrid([p, p]) + ggsize(1000, 300)
---------

ggplot() + geom_livemap()

📋 Checklist

• [x ] I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• [ x] I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[alshan]

I have read the CLA Document and I hereby sign the CLA

[mscolnick]

thanks @alshan! it just made the next release

[alshan]

Wow! That was fast ) thanx, @mscolnick !