feat: Add ratio plot support through .plot_ratio API (Sourcery refactored)

[sourcery-ai]

Pull Request #161 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
will be closed automatically.

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To manually merge these changes, make sure you're on the feat/add-plot-ratio-api branch, then run:

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git merge --ff-only FETCH_HEAD
git reset HEAD^

[sourcery-ai]

Function poisson_interval refactored with the following changes:

• Remove unreachable code (remove-unreachable-code)

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.02%.

Quality metrics	Before	After	Change
Complexity	11.18 🙂	11.20 🙂	0.02 👎
Method Length	139.00 😞	138.59 😞	-0.41 👍
Working memory	17.11 ⛔	17.12 ⛔	0.01 👎
Quality	41.91% 😞	41.93% 😞	0.02% 👍

Other metrics	Before	After	Change
Lines	661	660	-1

Changed files	Quality Before	Quality After	Quality Change
src/hist/plot.py	41.91% 😞	41.93% 😞	0.02% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/hist/plot.py	_plot_ratiolike	30 😞	570 ⛔	27 ⛔	11.11% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
src/hist/plot.py	plot_ratio	3 ⭐	306 ⛔	21 ⛔	37.17% 😞	Try splitting into smaller methods. Extract out complex expressions
src/hist/plot.py	plot2d_full	9 🙂	278 ⛔	14 😞	38.61% 😞	Try splitting into smaller methods. Extract out complex expressions
src/hist/plot.py	poisson_interval	4 ⭐	197 😞	15 😞	46.78% 😞	Try splitting into smaller methods. Extract out complex expressions
src/hist/plot.py	plot_pull	4 ⭐	200 😞	13 😞	49.23% 😞	Try splitting into smaller methods. Extract out complex expressions

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