feat: add on-demand price calculation

[matmair]

No description provided.

[netlify]

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

Name	Link
🔨 Latest commit	726c944
🔍 Latest deploy log	https://app.netlify.com/projects/inventree-web-pui-preview/deploys/693759fbd98ae800080b2417

[codecov]

Codecov Report

❌ Patch coverage is 68.96552% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.16%. Comparing base (3ca124c) to head (726c944).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10983      +/-   ##
==========================================
- Coverage   88.17%   88.16%   -0.02%     
==========================================
  Files        1289     1289              
  Lines       58036    58057      +21     
  Branches     1970     1970              
==========================================
+ Hits        51174    51186      +12     
- Misses       6371     6380       +9     
  Partials      491      491              

Flag	Coverage Δ
backend	89.46% <68.96%> (-0.02%)	⬇️

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Components	Coverage Δ
Backend Apps	92.01% <67.85%> (-0.02%)	⬇️
Backend General	93.47% <ø> (ø)
Frontend	70.86% <ø> (ø)

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