add api for retrieving getblockchaininfo RPC result

[philippem]

Many properties of the chain, especially for liquid, are reported by the getblockchaininfo RPC, that are not easily or directly retrievable from the current api.

An example of a property is the current fedpegscript, which is reported in the first block in each dynafed epoch (20160 for liquid mainnet). However the 20160 epoch length is a chain parameter, also reported by getblockchaininfo.

Adding a API resource that returns the current getblockchaininfo would assist thin clients in determining properties such as fedpegscript.

For bitcoin mainnet this resource would also be useful.

[philippem]

Here's an example of recent output of liquid mainnet getblockchaininfo:

  

{
  "chain": "liquidv1",
  "blocks": 2379700,
  "headers": 2379700,
  "bestblockhash": "85785a2a2b2d06bcd55fc4c5c3fd1acfd3b9666b5e01e5e38629b4ee9b2be44c",
  "mediantime": 1686167108,
  "verificationprogress": 1,
  "initialblockdownload": false,
  "size_on_disk": 16345234758,
  "pruned": false,
  "current_params_root": "a4da4cf43a5c344a6eb9d44acac448b5607ca8dc125209e0632afe3a5ec17db1",
  "current_signblock_asm": "0 80d146b4003a2f942bfc9a288c364cb3b7b0d72278d55f7fab93e1cad15331e6",
  "current_signblock_hex": "002080d146b4003a2f942bfc9a288c364cb3b7b0d72278d55f7fab93e1cad15331e6",
  "max_block_witness": 1325,
  "current_fedpeg_program": "0020333a4af67452308b9814ff59dc2fc3d0325fd7fdcb61d108e992b3956095f2fe",
  "current_fedpeg_script": "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",
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  ],
  "epoch_length": 20160,
  "total_valid_epochs": 2,
  "epoch_age": 820,
  "softforks": {
    "bip34": {
      "type": "buried",
      "active": true,
      "height": 0
    },
    "bip66": {
      "type": "buried",
      "active": true,
      "height": 0
    },
    "bip65": {
      "type": "buried",
      "active": true,
      "height": 0
    },
    "csv": {
      "type": "buried",
      "active": true,
      "height": 0
    },
    "segwit": {
      "type": "buried",
      "active": true,
      "height": 0
    },
    "dynafed": {
      "type": "bip9",
      "bip9": {
        "status": "active",
        "start_time": 1000000,
        "timeout": 9223372036854775807,
        "since": 1517040,
        "min_activation_height": 0
      },
      "height": 1517040,
      "active": true
    },
    "testdummy": {
      "type": "bip9",
      "bip9": {
        "status": "active",
        "start_time": 0,
        "timeout": 9223372036854775807,
        "since": 432,
        "min_activation_height": 0
      },
      "height": 432,
      "active": true
    },
    "taproot": {
      "type": "bip9",
      "bip9": {
        "status": "active",
        "start_time": 1554500,
        "timeout": 9223372036854775807,
        "since": 1663200,
        "min_activation_height": 0
      },
      "height": 1663200,
      "active": true
    }
  },
  "warnings": ""
}