Gaussian filter and smoothing recipe

[d-chambers]

Description

This PR addresses #296 by implementing a Patch.gaussian_filter method. Patch.savgol_filter was added previously.

Additionally, I created a recipe which demonstrates each of the smoothing methods (rolling, gaussian, savgol). I also tweaked the existing savgol_filter implementation so that multiple dimensions can be filtered in the same function call.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test. See testing guidelines.
• your name has been added to the contributors page (docs/contributors.md).
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8190ec7) 99.52% compared to head (671b6a1) 99.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #337   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          91       91           
  Lines        7192     7201    +9     
=======================================
+ Hits         7158     7167    +9     
  Misses         34       34           

Flag	Coverage Δ
unittests	99.52% <100.00%> (+<0.01%)	⬆️

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[d-chambers]

I am going to merge this so the new docs build (I need to setup an PR doc deployment, but not today...)

@ariellellouch do you mind taking a look before the next release (probably towards the end of next week) and open a new PR/issue if you can think of any changes to make?

[ariellellouch]

Thanks!
It looks good to me, so no need for a new PR
The only comment I have is that the .qmd file (line 112) seems to be cut mid-line

[d-chambers]

The only comment I have is that the .qmd file (line 112) seems to be cut mid-line

Thanks! I am not sure how I missed that.