feat: SObject record collection

[nkskaare]

Summary

This pull request introduces significant updates to the RecordCollection class in the src/apex/utils/classes/RecordCollection.cls file. The main changes involve improving type safety and adding new functionality to handle records based on specific fields.

Key changes include:

Type Safety Improvements:

• Removed the sObjectType member and added validation to ensure that the records list has a defined sObjectType in the RecordCollection constructor. Introduced a new TypeException class to handle type-related errors.
• Updated the add methods to include type checks, ensuring that only records or collections of the same sObjectType can be added to the RecordCollection.

New Functionality:

• Added a segmentOnField method that segments the records in the RecordCollection based on a specified field, returning a map of field values to lists of records.

These changes enhance the robustness and flexibility of the RecordCollection class, making it easier to manage and manipulate collections of SObjects while ensuring type consistency.