feat: stock return

[akshayitzme]

This PR adds the functionality for Shipment Return & Purchase Reciept Return

Shipment Return

• Update Schemas for Shipment Return
• Enable Shipment Return
• Tests
• Documentation: docs: stock return books_docs#19

Purchase Receipt Return

• Update Schemas for Purchase Receipt Return
• Enable Purchase Receipt Return
• Tests
• Documentation: docs: stock return books_docs#19

Shipment, Purchase Receipt Return Statuses

Status	Description
Return	Return Doc is Submitted
Return Issued	When a Return Doc is submitted against Shipment / Purchase Receipt

Shows Return Balance Item Qty

Screen Capture

2023-07-03.11-31-18.mp4

1. Consider a Scenario where the following Shipment Entry is created.

   #	Item	Qty
   1	Jacket	2

2. then the Customer returns one qty of the Item.

   #	Item	Qty	isReturn
   1	Jacket	-1	true

3. If the Customer again returns one qty of the same Item, only the remaining Qty left to return (-1) is shown in the Shipment Form.

   #	Item	Qty	isReturn
   1	Jacket	-1	true

[18alantom]

@akshayitzme if this is a rewrite of #636 you can close it

[akshayitzme]

@18alantom could you review this PR when you get time?

[18alantom]

Too many possible statuses they should be broken in to different groups. Will do it later.

[18alantom]

@akshayitzme along with all 29 review changes I need you to add the following two tests.

1. Using Batches:

   1. Create Shipment with two item rows
   2. Both should have the same item but different batches and different quantities
   3. Create its Shipment Return
   4. Ensure that quantities for both batches have been updated correctly

2. Using Serial Numbers:

   1. Create Purchase Receipt with an item row
   2. Item row should have more than one serial number
   3. Create its Purchase Receipt Return
   4. Ensure that quantities for both the Serial Numbers have been updated correctly
   5. Ensure that statuses for both Serial Numbers have been updated correctly

I need you to add these because this Stock Return PR doesn't take into account Batches and Serial Numbers and when one is returning Items using either of these it'll lead to unexpected bugs.

And so for the tests to pass you'll have to fix the handling of both in returns.

[18alantom]

Looks mostly fine, minor seemingly non feature threatening issues, merging.