[FEAT] - support /block/current API endpoint

[dtfiedler]

Arweave nodes support /block/current endpoint that returns all the relevant information about the most recently mined block. Support a matching endpoint in arlocal.

❯ curl https://arweave.net/block/current | jq '.'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  696k  100  696k    0     0  2469k      0 --:--:-- --:--:-- --:--:-- 2543k
{
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  "merkle_rebase_support_threshold": "151066495197430",
  "chunk_hash": "tZfB4ZWoDmzHYfWfM4uMdcCqbCzvW_VgV5pCtz95VFA",
  "block_time_history_hash": "cXXd_k2OCksx5LhLlWmsXBhpSymw0jlsyRd-0try9og",
  "recall_byte2": "22971810869392",
  "hash_preimage": "jGaTz7Ecsq-q9wyiQdKotHK8xiA_l5QL_vJD6hpEeBI",
  "recall_byte": "83325904906292",
  "reward": "727854128758",
  "previous_solution_hash": "____5-bzTEYy39vSrgGZxM8_KqsJ4EZtDCn2eSW_Vkg",
  "partition_number": 23,
  "nonce_limiter_info": {
    "output": "zMXgxuWTze62ctAZW_mEEIz5onBpx0nNV6OpslXlSuM",
    "global_step_number": 37904626,
    "seed": "BwUykJgPZx1LU9LzJI9xaWnsVxubJwad-7RrwfLY5VHirs5dEgieFmwnD3mXLhlo",
    "next_seed": "7SiN6MM3u80SmhaO9Cp7fiZCg9bRcg_7Z2md31iwdYl_MRBefOAWTMzT7nbyLNuz",
    "zone_upper_bound": 179453364838646,
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    "vdf_difficulty": "679425",
    "next_vdf_difficulty": "679425"
  },
  "poa2": {
    "option": "1",
    "tx_path": "..."
  }
}