Add support for custom solidity config file

[ioedeveloper]

This PR enables a user to provide a path to a custom config file for solidity compilation in remix.config.json.

  "solidity-compiler": {
    "language": "Solidity",
    "settings": {
      "optimizer": {
        "enabled": true,
        "runs": 200
      }
    }
  }
  
OR

  "solidity-compiler": "contracts/compiler_config.json"

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[yann300]

please add more details to the PR. how to reproduce, how did you fix the issue, etc..