…ity details

This commit makes all RecoveryFailure exceptions in the durability code substantially more informative by adding:

1. Byte position (from decoder.GetPosition()) to generic decode errors.

   • Infrastructure: BaseDecoder now exposes GetPosition/GetSize/SetPosition.

2. Actual entity identifiers (gids, labels, edge types, vertex gids) to wal.cpp LoadWal recovery logic.

3. Byte positions and gids to snapshot.cpp errors across all load paths.

Previously most errors were bare strings like 'Invalid WAL data!' or 'Invalid edge!'. They now include actionable context that makes debugging corrupted durability files significantly easier.

Files touched:

• src/storage/v2/durability/serialization.hpp/cpp
• src/storage/v2/durability/wal.cpp
• src/storage/v2/durability/snapshot.cpp

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