feat: Customize the sales invoice and purchase invoice

[NehaFathimap]

Feature description

1. need to customize the sales invoice and quotation Doctype
2. need to add field custom payment mode in sale invoice and quotation Doctype
3. need to add a field item table in sales invoice and quotation

Solution description

customized the sales invoice and quotation doctype

Output screenshots (optional)

Areas affected and ensured

Sales invocie and quotation doctype

Is there any existing behaviour change of other features due to this code change?

no

Was this feature tested on these browsers?

• Chrome