Add logs to exception on read_contract error

[mvandeberg]

Resolves #796

Brief description

Add logs to exception on read_contract error

Checklist

• I have built this pull request locally
• I have ran the unit tests locally
• I have manually tested this pull request
• I have reviewed my pull request
• I have added any relevant tests

Demonstration

$ curl -d '{"jsonrpc":"2.0", "method":"chain.read_contract", "params":{"contract_id":"15AJB59oTTNConTu9krF7ZnjbmBydSnfYA"}, "id":0}' http://localhost:8080/ | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   255  100   135  100   120   8605   7649 --:--:-- --:--:-- --:--:-- 36428
{
  "jsonrpc": "2.0",
  "error": {
    "code": -32603,
    "message": "reversion message",
    "data": "{\"code\":1,\"logs\":[\"log before an error\"]}"
  },
  "id": 0
}