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[bot]]

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 :warning:
src/backend/InvenTree/order/api.py	57.14%	3 Missing :warning:
src/backend/InvenTree/order/serializers.py	83.33%	2 Missing :warning:
src/backend/InvenTree/stock/api.py	92.30%	2 Missing :warning:
...ntend/src/tables/sales/SalesOrderLineItemTable.tsx	71.42%	1 Missing and 1 partial :warning:
src/backend/InvenTree/order/models.py	91.66%	1 Missing :warning:
src/frontend/src/tables/bom/BomTable.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/inventree/InvenTree/pull/8445/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/inventree/InvenTree/pull/8445/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | `85.86% <87.30%> (-0.05%)` | :arrow_down: | | [pui](https://app.codecov.io/gh/inventree/InvenTree/pull/8445/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | `68.57% <54.28%> (-0.22%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree#carryforward-flags-in-the-pull-request-comment) to find out more.

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