GET Outgoing Fees API endpoint

Added new API endpoint to List Outgoing Fees:

List Outgoing Fees

Example GET#OutgoingFees response:

{
  "current_page": 1,
  "per_page": 100,
  "total_outgoing_fees": 2,
  "total_pages": 0,
  "outgoing_fees": [
    {
      "amount_eur": "3.0",
      "applied_for": [
				"withdrawal",
				"void_transaction"
			],
      "currency": {
        "id": 50,
        "title": "Ethereum",
        "symbol": "ETH"
      },
      "crypto_platform": {
        "id": 1,
        "title": "Ethereum"
      }
    },
    {
      "amount_eur": "5.0",
      "applied_for": [
				"withdrawal",
			],
      "currency": {
        "id": 61,
        "title": "Dai",
        "symbol": "DAI"
      },
      "crypto_platform": {
        "id": 1,
        "title": "Ethereum"
      }
    }
  ]
}