Addressed #420 and #491

[kennethshsu]

• Addressed Store origin label as an attribute #420
• Addressed Empty triangle cannot be printed [BUG] #491
• Added xyz as test fixture
• Removed some debugger from a prior commit
• Added polars-lts-cpu into environment-dev.yaml since polars by itself is sometimes not supported on certain newer CPUs

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 80.62%. Comparing base (583760a) to head (b88308d).

Files	Patch %	Lines
chainladder/core/display.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #507      +/-   ##
==========================================
+ Coverage   80.57%   80.62%   +0.05%     
==========================================
  Files          80       80              
  Lines        4735     4739       +4     
  Branches      808      808              
==========================================
+ Hits         3815     3821       +6     
+ Misses        643      642       -1     
+ Partials      277      276       -1     

Flag	Coverage Δ
unittests	80.62% <40.00%> (+0.05%)	⬆️

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[jbogaardt]

I'm surprised we have polars in the dev environment. I've been experimenting with it in lieu of sparse, but haven't hit a point where it should be in the main branch.

[kennethshsu]

polars was already there I think, I only added the newer cpu version of it.

From the very limited few hours that I spent messing with it, I like it a lot and prefer it over sparse too.