[Build] Create child builds

[SchrodingersGat]

• Adds option (when creating a build order) to automatically generate child build orders
• Default = False (requires user intervention)

TODO

• Add unit tests
• Add note to documentation

[netlify]

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

Name	Link
🔨 Latest commit	5d78918
🔍 Latest deploy log	https://app.netlify.com/sites/inventree-web-pui-preview/deploys/66c5813dff19ce00081989d3

[codecov]

Codecov Report

Attention: Patch coverage is 97.91667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.23%. Comparing base (bbd432c) to head (5d78918).
Report is 5 commits behind head on master.

Files	Patch %	Lines
src/backend/InvenTree/build/api.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7941      +/-   ##
==========================================
- Coverage   83.47%   82.23%   -1.25%     
==========================================
  Files        1130     1130              
  Lines       50405    51834    +1429     
  Branches     1754     1755       +1     
==========================================
+ Hits        42078    42628     +550     
- Misses       7876     8753     +877     
- Partials      451      453       +2     

Flag	Coverage Δ
backend	85.22% <97.72%> (+0.01%)	⬆️
pui	65.18% <100.00%> (-0.11%)	⬇️

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[matmair]

Intresting addition. There might be room to do a wizard for creating subassemblies.