Sales order improvements

[SchrodingersGat]

This PR provides some general UI improvements for managing sales orders.

Additionally, it allows stock items to be allocated against a sales order, but without specifying a shipment. This is a useful addition as it allows users to allocate stock items against the sales order first, and decide on shipping details later on.

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[codecov]

Codecov Report

Attention: Patch coverage is 75.51020% with 24 lines in your changes missing coverage. Please review.

Project coverage is 83.31%. Comparing base (8f24119) to head (ed4e593).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...end/src/tables/sales/SalesOrderAllocationTable.tsx	31.57%	10 Missing and 3 partials ⚠️
src/backend/InvenTree/order/api.py	57.14%	3 Missing ⚠️
src/backend/InvenTree/order/serializers.py	83.33%	2 Missing ⚠️
src/backend/InvenTree/stock/api.py	92.30%	2 Missing ⚠️
...ntend/src/tables/sales/SalesOrderLineItemTable.tsx	71.42%	1 Missing and 1 partial ⚠️
src/backend/InvenTree/order/models.py	91.66%	1 Missing ⚠️
src/frontend/src/tables/bom/BomTable.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8445      +/-   ##
==========================================
- Coverage   84.52%   83.31%   -1.21%     
==========================================
  Files        1170     1171       +1     
  Lines       53468    54338     +870     
  Branches     2005     2011       +6     
==========================================
+ Hits        45192    45271      +79     
- Misses       7751     8536     +785     
- Partials      525      531       +6     

Flag	Coverage Δ
backend	85.86% <87.30%> (-0.05%)	⬇️
pui	68.57% <54.28%> (-0.22%)	⬇️

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