Add functionality to deal with rounding errors in accounting

[BerglundDaniel]

Summary by CodeRabbit

• New Features

  • Enhanced transaction fee splitting to address rounding errors.
  • Introduced handling of rounding errors in accounting export functionality.

• Bug Fixes

  • Improved accuracy in financial calculations by managing rounding discrepancies.

• Tests

  • Added tests to ensure proper handling of rounding errors in transaction fee splitting and exports.

[coderabbitai[bot]]

Walkthrough

The recent updates involve modifying the accounting system to handle rounding errors more effectively. New enumerations and data classes have been introduced to define and track rounding errors. Functions within the accounting system have been updated to incorporate the handling of these errors. Additionally, the test suite has been expanded with new tests and updates to existing tests to ensure that the handling of rounding errors is thoroughly verified.

Changes

File Path	Change Summary
api/src/shop/accounting/accounting.py	Added RoundingErrorSource enum and RoundingError dataclass; modified functions to handle rounding errors.
api/src/shop/accounting/export.py	Imported new rounding error classes; added new function and updated export_accounting to handle rounding errors.
api/src/shop/accounting/test/accounting_test.py	New tests added for rounding error handling; existing tests updated to include rounding error checks.

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