feat: add on-demand price calculation

[matmair]

This re-introduces the option to calculate the price for a line item

[netlify]

✅ Deploy Preview for inventree-web-pui-preview canceled.

Name	Link
🔨 Latest commit	b001486
🔍 Latest deploy log	https://app.netlify.com/projects/inventree-web-pui-preview/deploys/698d12755d7b1b000875db1c

[codecov]

Codecov Report

❌ Patch coverage is 58.82353% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.06%. Comparing base (ee10bbb) to head (b001486).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10983      +/-   ##
==========================================
- Coverage   88.08%   88.06%   -0.02%     
==========================================
  Files        1292     1292              
  Lines       58481    58507      +26     
  Branches     1943     1943              
==========================================
+ Hits        51511    51525      +14     
- Misses       6486     6498      +12     
  Partials      484      484              

Flag	Coverage Δ
backend	89.28% <58.82%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Backend Apps	91.78% <57.57%> (-0.04%)	⬇️
Backend General	93.61% <ø> (ø)
Frontend	70.87% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 44 untouched benchmarks

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_{Comparing matmair:feat-add-calculation (b001486) with master (fa32d5f)¹}

Footnotes

1. No successful run was found on master (ee10bbb) during the generation of this report, so fa32d5f was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩