Make prettySymbol specific per token per chain

[ecdsafu]

Description

Currently ITS integrators can define prettySymbol at the top level per token. This should instead be set per token per chain.

If the prettySymbol isn’t defined for a particular chain, then the config export should default to the top-level symbol per chain.

Acceptance criteria

• Add prettySymbol to be available within chains[n].prettySymbol
• Remove prettySymbol at the top layer
• Pretty symbol could be optional, or could default to symbol when using the generator script
• Update wiki if necessary

Current config

{
      "tokenId": "0x6ce7a978114b2d34ee7b776ef36ee49c18752e35b7507c16994d5928332a6426",
      "deployer": "0x87e1237074760F57b424121edcA06F082700dBC2",
      "originalMinter": null,
      "prettySymbol": "NFTL",
      "decimals": 18,
      "originAxelarChainId": "ethereum",
      "tokenType": "interchain",
      "deploySalt": "0xdeead7ca2bddea93a28a9a71a5b53be2c9439b691fcaebf02fbf41f4ae78a528",
      "iconUrls": {
        "svg": "https://raw.githubusercontent.com/axelarnetwork/axelar-configs/main/images/tokens/nftl.svg"
      },
      "deploymentMessageId": "0x19f1e3cb4ce6c8e2a54764c86fe49bca583bbc2b4772190318445a2167121216-343",
      "chains": [
        {
          "symbol": "NFTL",
          "name": "Nifty League",
          "axelarChainId": "ethereum",
          "tokenAddress": "0x3c8D2FCE49906e11e71cB16Fa0fFeB2B16C29638",
          "tokenManager": "0x3150A2bA908A11eBE137B977C54c19bf971bb6c7",
          "tokenManagerType": "lockUnlock"
        },
        {
          "symbol": "NFTL",
          "name": "Nifty League",
          "axelarChainId": "immutable",
          "tokenAddress": "0xB0d7e9Ff5fb8E739c4990f7920d8047AcfAe4884",
          "tokenManager": "0x3150A2bA908A11eBE137B977C54c19bf971bb6c7",
          "tokenManagerType": "mintBurn"
        }
      ]
    },

Desired config

{
      "tokenId": "0x6ce7a978114b2d34ee7b776ef36ee49c18752e35b7507c16994d5928332a6426",
      "deployer": "0x87e1237074760F57b424121edcA06F082700dBC2",
      "originalMinter": null,
      "decimals": 18,
      "originAxelarChainId": "ethereum",
      "tokenType": "interchain",
      "deploySalt": "0xdeead7ca2bddea93a28a9a71a5b53be2c9439b691fcaebf02fbf41f4ae78a528",
      "iconUrls": {
        "svg": "https://raw.githubusercontent.com/axelarnetwork/axelar-configs/main/images/tokens/nftl.svg"
      },
      "deploymentMessageId": "0x19f1e3cb4ce6c8e2a54764c86fe49bca583bbc2b4772190318445a2167121216-343",
      "chains": [
        {
          "symbol": "NFTL",
          "prettySymbol": "NFTL.axl",
          "name": "Nifty League",
          "axelarChainId": "ethereum",
          "tokenAddress": "0x3c8D2FCE49906e11e71cB16Fa0fFeB2B16C29638",
          "tokenManager": "0x3150A2bA908A11eBE137B977C54c19bf971bb6c7",
          "tokenManagerType": "lockUnlock"
        },
        {
          "symbol": "NFTL",
          "prettySymbol": "NFTL.axl",
          "name": "Nifty League",
          "axelarChainId": "immutable",
          "tokenAddress": "0xB0d7e9Ff5fb8E739c4990f7920d8047AcfAe4884",
          "tokenManager": "0x3150A2bA908A11eBE137B977C54c19bf971bb6c7",
          "tokenManagerType": "mintBurn"
        }
      ]
    },