Tests Needed For Valkey Compatibility

[HDT3213]

Parsing support for Valkey 9+ RDB files, including:

• VALKEY magic number (RDB version 80)
• typeHash2 encoding (Hash with field-level expiration, Valkey format)
• opCode SlotInfo (244) and opCode SlotImport (243)

What to test:

• Parse a Valkey 9+ RDB dump with rdb -c json and verify all data types are correctly parsed
• Specifically test Hash objects with field-level expiration (HEXPIRE / HPEXPIRE) — verify field expirations are output correctly
• Test on Valkey cluster mode RDB files (which contain SlotInfo/SlotImport opcodes)
• Verify that Redis 7.4+ Hash with HFE (field expiration) still works correctly after the refactoring