[proposal] Add support for multiple chain

[linkdesu]

Hi! I have a proposal for more flexible data structure. Why an explorer can only explore one chain?🧐 Of course not!🤩 This new data structure will make it possible to support as many as chains an explorer can. For example, url template of EOSPark could be something like this:

{
  "name":"EOS Park",
  "chains": [
    { // Main chain
      "chainId": "aca376f206b8fc25a6ed44dbdc66547c36c6c33e3a119ffbeaef943642f0e906",
      "account": "https://eospark.com/MainNet/account/{x}",
      "transaction": "https://eospark.com/MainNet/tx/{x}",
      "block": "https://eospark.com/MainNet/block/{x}",
      "default": true                         // or chains[0] can be always default
    },
    { // Jungle chain
      "chainId": "038f4b0fc8ff18a4f0842a8f0564611f6e96e8535901dd45e43ac8691a1c4dca",
      "account": "https://jungle.eospark.com/MainNet/account/{x}",
      "transaction": "https://jungle.eospark.com/MainNet/tx/{x}",
      "block": "https://jungle.eospark.com/MainNet/block/{x}"
    },
    { // Kylin chain
      "chainId": "5fff1dae8dc8e2fc4d5b23b2c7665c97f9e9d8edf2b6485a86ba311c25639191",
      "account": "https://kylin.eospark.com/MainNet/account/{x}",
      "transaction": "https://kylin.eospark.com/MainNet/tx/{x}",
      "block": "https://kylin.eospark.com/MainNet/block/{x}"
    }
  ]
}

ChainId is better than name, for example jungle chain has been updated recently, their name is not change but their chainId is changed.

[nsjames]

Yeah definitely agree this will soon be needed more and more too as more fork/side chains appear.
I think we'll add a new explorers_v2.json at some point with a finer structure.