Overhaul futures asset config storage and usage within GCT

[thrasher-]

New Issue

Right now there's a lot of different asset types which GCT supports like asset.PerpetualFutures, asset.Futures, asset.CoinMarginedFutures, asset.DeliveryFutures, asset.PerpetualContract, asset.LinearContract etc. which can all be simplified.

For config storage of futures instruments and usage of them within GCT, we could make their storage/retrieval and usage more precise/informative by changing the way we store them as follows:

{
  "futuresContracts": {
    "perpetual": {
      "settlementTypes": [
        {
          "type": "linear",
          "currency": "USDT",
          "pairFormat": "{BASE}-USDT",
          "examplePair": "BTC-USDT"
        },
        {
          "type": "linear",
          "currency": "USDC",
          "pairFormat": "{BASE}-USDC",
          "examplePair": "BTC-USDC"
        },
        {
          "type": "inverse",
          "currency": "coin",
          "pairFormat": "{BASE}-USD",
          "examplePair": "BTC-USD"
        }
      ]
    },
    "futures/delivery/expiry (take your pick)": {
      "settlementTypes": [
        {
          "type": "linear",
          "currency": "USDT",
          "pairFormat": "{BASE}-USDT-{EXPIRY}",
          "examplePair": "BTC-USDT-29122024"
        },
        {
          "type": "linear",
          "currency": "USDC",
          "pairFormat": "{BASE}-USDC-{EXPIRY}",
          "examplePair": "BTC-USDC-29122024"
        },
        {
          "type": "inverse",
          "currency": "coin",
          "pairFormat": "{BASE}-USD-{EXPIRY}",
          "examplePair": "BTC-USD-29122024"
        }
      ]
    }
  }
}

[gbjk]

We're going to wait for #1671 before tackling this, since it'll make the work easier.

[gbjk]

Started to bleed into work that would become redundant after this during
config assetEnabled
I've branched it out to asset simplification and can fold that into this task.