Define Indexdb/Dexie database and datamodel

[dt2patel]

Write script to create database in Indexdb using Dexie library.

Define entity model for

1. Product
2. ScanEvent
3. InventoryCountImportItem
4. Write test cases for

Find or create database
Create/Find ScanEvent, InventoryCountImportItem

https://github.com/saastechacademy/foundation/blob/main/project-ideas/fulfillment-center-mgmt/inv-cycle-count/product-master.md
https://github.com/saastechacademy/foundation/blob/main/project-ideas/fulfillment-center-mgmt/inv-cycle-count/pk-generation-strategy.md