Add substitute details to BOM export

[mredpath2]

The following changes to BOM Export as per #5179 :

1. Added substitute part IPN to BOM export when "Include Alternative Parts" is selected
2. Add Part Revision to BOM export as requested by @hugozijlmans

I also thought about adding substitute manufacturer and supplier details. But I wasn't sure if this would clog up the BOM export with too many columns if there were multiple alternates and they each had multiple SPN and MPN? So, I haven't included this change.

Closes #5179

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[SchrodingersGat]

@mredpath2 thanks for the additions :)

[SchrodingersGat]

You will need to address the style issues so that the rest of the tests can run

[mredpath2]

You will need to address the style issues so that the rest of the tests can run

Should be resolved now :)

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 83.69%. Comparing base (96abd08) to head (c4ac76a).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/backend/InvenTree/part/bom.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7563      +/-   ##
==========================================
- Coverage   83.70%   83.69%   -0.01%     
==========================================
  Files        1118     1118              
  Lines       49542    49549       +7     
  Branches     1625     1625              
==========================================
+ Hits        41469    41470       +1     
- Misses       7641     7647       +6     
  Partials      432      432              

Flag	Coverage Δ
backend	85.35% <14.28%> (-0.02%)	⬇️

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[SchrodingersGat]

@mredpath2 you will also need to update the unit test which checks the columns in the generated BOM file:

[matmair]

Looking great!

[hugozijlmans]

Thanks @mredpath2. I'm not sure if many people were missing this feature however I'm very glad it's implemented as usually we use partnumber as BOM line item but for custom items (in our case PCB or PCBA) it's very helpfull to use the revision to show it's still the same part but a new version.

[SchrodingersGat]

@mredpath2 thanks for the contribution :)