✨ add function to calculate item weights by cheapest possible cost

[twentylemon]

Summary

It's not used yet in the solver, I couldn't get it to work as I wanted. It also seems to be a little wrong still, since StitchedIronPlate, for example, should probably be cheaper than the default recipe for super plates. It may be an approx thing, but I haven't looked that deeply into it yet. The alternate weights also ended up producing some wonky solutions in only ways optimizers can; it'd find extremely convoluted solutions that use many different recipes which would end up minimizing the new costs (though, only with non-raw factory inputs, the typical input+maximize still works fine).

I added two solver tests to show the issue that I was trying to resolve here. It is an edge case, at any rate.

Note that the changes to the solver file are only moving the declarations to a new file. alternate_weights is the only real new code (some minor alterations otherwise, but only cleanup [moving auxiliary item weighing, all_items addition in minmax_weights function).

Checklist

• this is a source code change
  • run format in the repository root
  • run pytest in the repository root
  • link to issue being fixed using a fixes keyword, if such an issue exists
  • update the wiki documentation if necessary
• or, this is not a source code change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.51%. Comparing base (f7a8edd) to head (b0b08e6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1003      +/-   ##
==========================================
+ Coverage   96.46%   96.51%   +0.04%     
==========================================
  Files          94       95       +1     
  Lines        2206     2237      +31     
  Branches      160      165       +5     
==========================================
+ Hits         2128     2159      +31     
  Misses         67       67              
  Partials       11       11              

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[jameshughes89]

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