feat: update UnitOfWork + Mocker

[nkskaare]

Summary

This pull request introduces enhancements to the Mocker and AssertionBuilder classes, adding new functionalities for method stubbing and assertion in the Apex testing framework. The most important changes include the addition of the AssertionBuilder class, modifications to the Mocker class to support more detailed stubbing and assertion, and updates to the UnitOfWorkTest class to reflect these changes.

New Features:

• src/apex/utils/classes/UnitOfWork.cls: Move dmlhandler and key generation responsibility to the transaction itself. Allows for different dmlhandlers for unique transactions and also gives the possibility to add transactions to one another.

• src/apex/utils/classes/AssertionBuilder.cls: Introduced the AssertionBuilder class to facilitate the creation of method call assertions with various configurations, such as argument-specific assertions and call count assertions.

• src/apex/utils/classes/Mocker.cls: Added support for argument-specific method stubbing and assertion, including new methods like stub, assertMethodCalled, and updated the MockRegistry to handle argument-specific keys. [1] [2] [3] [4] [5] [6] [7] [8]

Updates to Existing Code:

• src/apex/utils/classes/tests/UnitOfWorkTest.cls: Adjusted test cases to utilize the new Mocker and AssertionBuilder functionalities, ensuring compatibility with the updated mocking and assertion mechanisms. [1] [2] [3]