Extract a products/stock component

[elia]

Summary

Both the stock and status component now accept basic values in the initializer and have an alternative from_product constructor that will get those basic values from a Spree::Product object.

Checklist

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[codecov]

Codecov Report

Merging #5433 (595b072) into main (7869560) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5433      +/-   ##
==========================================
+ Coverage   88.86%   88.88%   +0.01%     
==========================================
  Files         610      611       +1     
  Lines       14793    14799       +6     
==========================================
+ Hits        13146    13154       +8     
+ Misses       1647     1645       -2     

Files	Coverage Δ
...mponents/solidus_admin/products/index/component.rb	90.90% <100.00%> (+4.06%)	⬆️
...ponents/solidus_admin/products/status/component.rb	100.00% <100.00%> (ø)
...mponents/solidus_admin/products/stock/component.rb	100.00% <100.00%> (ø)

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[rainerdema]

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