feat: price list

[akshayitzme]

This PR adds the functionality for Price Lists

• Price List & Item Price (child table) schema

  Enable Price List in General Settings

  

  Price List page visible only if Price List enabled in General Settings

  

• Enable Price List

  Price List in Purchase Invoice

  
  Price List in Sales Invoice

  

• tests

• documentation: docs: price list books_docs#15

Functional Details

1. Price Lists are Filtered in Invoice Form

   • Only Enabled Price Lists will show up in the Invoice Forms.
   • In Sales Invoice Form, Only Price Lists with the Selling option enabled will appear in the Price List Selector.
   • In Purchase Invoice Form, Only Price Lists with the Buying option enabled will appear in the Price List Selector.
     

     books/models/baseModels/Invoice/Invoice.ts

     Lines 549 to 552 in fd0fba6

     	priceList: (doc: Doc) => ({
     	enabled: true,
     	...(doc.isSales ? { selling: true } : { buying: true }),
     	}),

2. Price List Enabled For Status

   Status	Description
   None	Not Enabled any one or both of Buying or Selling
   Buying	Price List only Enabled for Buying
   Selling	Price List only Enabled for Selling
   Buying & Selling	Price List Enabled for both Buying and Selling

[18alantom]

PR has several feature design related issues. Irrespective, I'm merging it since all this back and forth is time consuming, and this PR (well the previous price list PRs) have been pending for a while.

Will raise a fix PR soon.