Batch code generation (#7000)

* Refactor framework for generating batch codes

- Provide additional kwargs to plugin
- Move into new file
- Error handling

* Implement API endpoint for generating a new batch code

* Fixes

* Refactor into stock.generators

* Fix API endpoint

* Pass time context through to plugins

* Generate batch code when receiving items

* Create useGenerator hook

- Build up a dataset and query server whenever it changes
- Look for result in response data
- For now, just used for generating batch codes
- may be used for more in the future

* Refactor PurchaseOrderForms to use new generator hook

* Refactor StockForms implementation

* Remove dead code

* add OAS diff

* fix ref

* fix ref again

* wrong branch, sorry

* Update src/frontend/src/hooks/UseGenerator.tsx

Co-authored-by: Lukas <76838159+wolflu05@users.noreply.github.com>

* Bump API version

* Do not override batch code if already generated

* Add serial number generator

- Move to /generate/ API endpoint
- Move batch code generator too

* Update PUI endpoints

* Add debouncing to useGenerator hook

* Refactor useGenerator func

* Add serial number generator to stock form

* Add batch code genereator to build order form

* Update buildfields

* Use build batch code when creating new output

---------

Co-authored-by: Matthias Mair <code@mjmair.com>
Co-authored-by: Lukas <76838159+wolflu05@users.noreply.github.com>

docs/docs/extend/plugins/validation.md

@@ -116,7 +116,7 @@ Validation of the Part IPN (Internal Part Number) field is exposed to custom plu
 
 The `validate_batch_code` method allows plugins to raise an error if a batch code input by the user does not meet a particular pattern.
 
-The `generate_batch_code` method can be implemented to generate a new batch code.
+The `generate_batch_code` method can be implemented to generate a new batch code, based on a set of provided information.
 
 ### Serial Numbers