feat: added rdb format draft support

[WoozyMasta]

resourceDatabase.rdb is a companion resource index file stored next to .pak archives.
It contains resource paths and metadata used by Enfusion/Workbench to track available project/addon content.

This draft

• Adds a prototype rdb implementation in paс1.
• Supports reading and writing FORM/RDBC.
• Supports core node types currently observed (2/4/5/6/7/22).
• Provides safe parse/marshal roundtrip for covered layouts.

Current Limits

• This is not a complete format specification yet.
• More research is required, especially for:
  • exact Key64 meaning/algorithm
  • exact FieldA semantics (notably type=2 and some binary type=6 entries)
  • exact FieldB semantics
  • header Reserved* fields
  • full behavioral model of mod-heavy type=2 records