This commit introduces a new `tax.js` module containing functions for tax rate resolution and amount calculation with tax. The `amountWithTax` and `resolveTaxRate` functions are integrated into various schemas, including `invoice`, `orderitem`, `shipment`, `courierservice`, `filament`, `part`, and `product`, enhancing their ability to compute amounts with applicable taxes. Additionally, corresponding tests are added to ensure the correctness of the new tax-related functionalities.
This commit introduces several utility functions in `utils.js` to improve ObjectId handling, including `isByte`, `isTwelveByteBuffer`, and `objectIdToString`. The `expandObjectIds` function is updated to better handle various ObjectId formats, including BSON ObjectIds and serialized 12-byte buffers. Additionally, comprehensive tests are added in `utils.expandObjectIds.test.js` to verify the correct behavior of these enhancements, ensuring robust handling of ObjectId conversions and expansions.
