Add TripResponseMapper

[ksharma-xyz]

TL;DR

Refactored TimeTableViewModel to improve code organization and readability.

What changed?

• Extracted journey list building logic from TimeTableViewModel to a new file TripResponseMapper.kt.
• Created two new functions: buildJourneyList() and logForUnderstandingData().
• Moved interchangeStopsList() function to the new file.
• Updated TimeTableViewModel to use the new functions.

Why make this change?

This refactoring improves code organization and maintainability by:

1. Separating concerns: Moving data processing logic out of the ViewModel.
2. Enhancing readability: Breaking down complex functions into smaller, more focused ones.
3. Facilitating easier testing and future modifications to the journey list building process.

[ksharma-xyz]

• Update TripResponse mapper business logic #173
• Add TripResponseMapper #172 👈
• main

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