DB: Add NSW stops tables and queries

[ksharma-xyz]

TL;DR

Added NSW stops database tables and related queries to support stop location functionality.

What changed?

• Created new tables NswStops and NswStopProductClass to store stop information and their associated product classes
• Added SQL queries for inserting and selecting stops based on name and product class filters
• Implemented new Sandook interface methods for managing NSW stops data
• Added migration script for version 2 to create the new tables
• Added documentation for generating Kotlin files from SQL tables

How to test?

1. Run ./gradlew generateCommonMainKrailSandookInterface to generate updated Kotlin files
2. Verify the new tables are created by:
   • Inserting a stop using insertNswStop
   • Adding product classes with insertNswStopProductClass
   • Querying stops using the new select methods
3. Test different stop search scenarios:
   • Partial name matching
   • Filtering by included product classes
   • Filtering by excluded product classes

Why make this change?

To support the storage and retrieval of NSW transport stop locations and their associated transport modes (product classes), enabling location-based features and stop searching functionality in the KRAIL app.

[ksharma-xyz]

• IO: Add NSW stops proto parser and resources #629
• IO: Add GTFS protobuf module and Wire plugin #628
• DB: Add NSW stops tables and queries #627 👈 (View in Graphite)
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