Extend DUMP & RESTORE to support object types (#1343)

[adirathore1402]

DUMP and RESTORE previously supported only string values. This extends them to Set, SortedSet, Hash and List objects by serializing/deserializing via GarnetObjectSerializer, wrapping the payload in the existing DUMP envelope (value-type byte + RESP length + payload + RDB version + CRC64).

Also fixes the DUMP CRC64 to cover the value-type byte (matching RESTORE and Redis); this was previously masked because the string type byte is 0x00, which does not affect a CRC-64 with zero initial value.

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[Copilot]

Pull request overview

Extends RESP DUMP/RESTORE handling to round-trip collection objects.

Changes:

• Adds object serialization and restoration paths.
• Includes value-type bytes in CRC64 generation.
• Adds collection, TTL, and existing-key tests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
libs/server/Resp/KeyAdminCommands.cs	Implements object DUMP/RESTORE handling.
test/standalone/Garnet.test/RespTests.cs	Adds object round-trip tests.

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