#258 - Add an endpoint that takes a structured query and validates it

[michael-82]

• Return invalid criteria (termcode/context) instead of just termcode
• Replace old /validate endpoint with the new one
• add swagger documentation for the endpoint
• When no invalid terms are found, return an empty array instead of omitting the parameter
• Don't include the invalid terms list in the structured query itself but create a new object ValidatedStructuredQuery, containing the original query and the list of invalid terms
• Add a new endpoint that takes a structured query and sends back the same query with additional invalidTerms if present

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 75.48%. Comparing base (f6d09ee) to head (b5c1a6d). Report is 1 commits behind head on develop.

Files	Patch %	Lines
...end/terminology/validation/TermCodeValidation.java	72.72%	2 Missing and 1 partial :warning:
...query/api/validation/StructuredQueryValidator.java	60.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #265 +/- ## ============================================= - Coverage 75.56% 75.48% -0.09% - Complexity 540 543 +3 ============================================= Files 124 125 +1 Lines 2218 2235 +17 Branches 108 109 +1 ============================================= + Hits 1676 1687 +11 - Misses 478 483 +5 - Partials 64 65 +1 ```

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