Rename `solana_consensus` to `solana`

[fadeev]

Let's add some consistency: ethereum, tendermint, bitcoin and solana_consensus.

{
  "chains": [
    {
      "chain_id": "97",
      "chain_name": "bsc_testnet",
      "network": "bsc",
      "network_type": "testnet",
      "vm": "evm",
      "consensus": "ethereum",
      "is_external": true,
      "cctx_gateway": "observers",
      "name": "bsc_testnet"
    },
    {
      "chain_id": "7001",
      "chain_name": "zeta_testnet",
      "network": "zeta",
      "network_type": "testnet",
      "vm": "evm",
      "consensus": "tendermint",
      "is_external": false,
      "cctx_gateway": "zevm",
      "name": "zeta_testnet"
    },
    {
      "chain_id": "18332",
      "chain_name": "btc_testnet",
      "network": "btc",
      "network_type": "testnet",
      "vm": "no_vm",
      "consensus": "bitcoin",
      "is_external": true,
      "cctx_gateway": "observers",
      "name": "btc_testnet"
    },
    {
      "chain_id": "901",
      "chain_name": "solana_devnet",
      "network": "solana",
      "network_type": "testnet",
      "vm": "svm",
      "consensus": "solana_consensus",
      "is_external": true,
      "cctx_gateway": "observers",
      "name": "solana_devnet"
    }
  ]
}

https://zetachain-athens.blockpi.network/lcd/v1/public/zeta-chain/observer/supportedChains