Added %sqlplot tests

[mehtamohit013]

Describe your changes

Added %sqlplot tests for boxplot and histogram

Issue number

Closes #526

Checklist before requesting a review

• Performed a self-review of my code
• Formatted my code with pkgmt format
• Added tests (when necessary).
• Added docstring documentation and update the changelog (when needed)

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📚 Documentation preview 📚: https://jupysql--628.org.readthedocs.build/en/628/

[yafimvo]

looks good.

@mehtamohit013
Can we add more complex cases (a large number of bins (100/250/500), 2 plots, custom style, vertical/horizontal bar)? For this, we'll probably need a more complete dataset.

We can use these as references:

plot

ggplot

[mehtamohit013]

@yafimvo

• Changed the dataset.
• Modified the bin size to 300
• Added custom graph (i.e. added grid)
• Histogram doesn't support orientation, so not added

What do you mean by 2 plots? 2 histogram in one?

TLDR: Added all the plots present in %sqlplot doc

[yafimvo]

@mehtamohit013
lgtm. Just one comment about the fixture and I think it's ready for merge.

What do you mean by 2 plots? 2 histogram in one?

Yes. I see you already did it.