[State sync] Configure localnet for dumping and downloading state to/from filesystem

[tayfunelmas]

Make sure the localnet configuration support dumping state to local filesystem and running state sync over this dump. This issue is valid for centralized state sync, which is done in mainnet/testnet via cloud storage.

One node should be configured to dump state to filesystem:

"state_sync": {
    "dump": {
      "ExternalStorage": {
        "location": {
          "Filesystem": {
            "root_dir": "state-parts"
          }
        }
      }
    }
  },

and other nodes should be configured to sync state from local filesystem.

"state_sync": {
    "sync": {
      "ExternalStorage": {
        "location": {
          "Filesystem": {
            "root_dir": "state-parts"
          }
        },
        "num_concurrent_requests": 25,
        "num_concurrent_requests_during_catchup": 5
      }
    }
  },

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