feat: updates service accept header to application/json

[karel-rehor]

Closes #719 Closes #744

Proposed Changes

• changes Accept header in InfluxQLQueryService to application/json
• adds deserializers for json results
• adds tests

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] A test has been added if appropriate
• [x] mvn test completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 87.85047% with 13 lines in your changes missing coverage. Please review.

Project coverage is 88.51%. Comparing base (546197d) to head (92295f9). Report is 10 commits behind head on master.

Files	Patch %	Lines
...influxdb/client/internal/InfluxQLQueryApiImpl.java	91.56%	4 Missing and 3 partials :warning:
...n/java/com/influxdb/internal/AbstractQueryApi.java	28.57%	4 Missing and 1 partial :warning:
...java/com/influxdb/client/domain/InfluxQLQuery.java	94.11%	0 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #733 +/- ## ============================================ + Coverage 88.37% 88.51% +0.14% + Complexity 786 784 -2 ============================================ Files 174 174 Lines 7091 7195 +104 Branches 391 405 +14 ============================================ + Hits 6267 6369 +102 + Misses 698 696 -2 - Partials 126 130 +4 ```

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