feat(cli): add reth db get rocksdb subcommand

[HuberyJulianay]

Adds RocksDB support to the reth db get command, completing the tooling for RocksDB tables alongside MDBX and static files.

Usage:

  reth db get rocksdb transaction-hash-numbers '"0xabc..."'
  reth db get rocksdb accounts-history '{ "key": "0x...", "highest_block_number": 12345 }'
  reth db get rocksdb storages-history '...' --raw

This was the last missing piece - we now have checksum (#21217), list(#21364), and get(this) for RocksDB. Users can finally look up specific entries without iterating through the entire table.

[HuberyJulianay]

@mattsse Hi boss, could this s-stale label be removed? cc @joshieDo

[emmajam]

Hey! We're doing some spring cleaning on our PR backlog 🧹 Closing old PRs to keep things tidy. If this is still relevant, please feel free to re-open — we appreciate your contribution!