test-server $cql returns 400 on cql-to-elm translation errors

[dehall]

This PR adds a check for cql-to-elm translation errors in the test-server $cql operation, and if any occur, the return is now HTTP 400 with the translation error. This is implemented by adding a new TranslationError class. I added one test case with Codex but I'm still thinking about how best to add more.

This is targeted at cql-tests that have invalid="true", for instance test "EquivTupleJohnJohnFalse". cql-tests-runner results from before and after this change:

Before:

    {
      "testsName": "CqlComparisonOperatorsTest",
      "groupName": "Equivalent",
      "testName": "EquivTupleJohnJohnFalse",
      "expression": "Tuple { Id : 1, Name : 'John', Position: 'Shift Manager' } ~ Tuple { Id : 1, Name : 'John' }",
      "testStatus": "fail",
      "responseStatus": 200,
      "actual": "null",
      "invalid": "true",
    },

After:

{
[...]
      "testStatus": "pass",
      "responseStatus": 400,
      "actual": "{\"error\":\"Could not resolve call to operator Equivalent with signature (tuple{Id:System.Integer,Name:System.String,Position:System.String}, tuple{Id:System.Integer,Name:System.String}).\"}",
      "invalid": "true",
    },

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Submitter:

• This pull request describes why these changes were made
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  Reviewer:

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• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.22%. Comparing base (31bcad1) to head (cfb4121).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #379   +/-   ##
=======================================
  Coverage   89.22%   89.22%           
=======================================
  Files          60       60           
  Lines        5116     5116           
  Branches     1468     1468           
=======================================
  Hits         4565     4565           
  Misses        316      316           
  Partials      235      235           

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[cmoesel]

This looks great. Thank you!