Create vendor app.

[shovan777]

Add Vendor models.
Set relations to user, warehouse and allocation model.

I want to discuss this change where vendor, app models and relation are created.

Impact

• New migrations
• New/Updated API fields or mutations
• Deprecated API fields or mutations
• Removed API types, fields, or mutations
• Documentation needs to be updated

Pull Request Checklist

• Privileged queries and mutations are guarded by proper permission checks
• Database queries are optimized and the number of queries is constant
• Database migration files are up to date
• The changes are tested
• GraphQL schema and type definitions are up to date
• Changes are mentioned in the changelog

[sushilkhadka165]

Detaching the warehouse from vendor model and relationing both in the new model would be nice because warehouse and vender related fields can be made there where as vendor only related fields can be used in vendor model. so rather than creating the many to many it would be nice in new model

class VendorWarehoue(models.Model): vendor = models.Foreignkey(Vendor) warehouse = models.OneToOneField(Warehouse) ......