fix: return str instead of urllib3.HTTPResponse for `InfluxDBClie…

[jules-ch]

Closes #569

Proposed Changes

As it is done in the Async version of the client, return str response data as per the documentation.

Checklist

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

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.11%. Comparing base (2f9e5ed) to head (a05c5b0).
⚠️ Report is 53 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
- Coverage   90.30%   90.11%   -0.20%     
==========================================
  Files          39       39              
  Lines        3456     3430      -26     
==========================================
- Hits         3121     3091      -30     
- Misses        335      339       +4     

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[jules-ch]

I had to use .data, using .read function with debug resulted with a bug when the response already read by the debugger it returned an empty string.
I'd have to check it is not the case with the async function.

[jules-ch]

Ready for review

[bednar]

Hi @jules-ch,

Thank you for your PR. Could you please update the CHANGELOG.md to indicate that this is a breaking change and provide guidance on how users should address it?

Thanks!

[jules-ch]

Do you need me to introduce this as a BREAKING CHANGE.
Just want to wonfirm this, since the function was not returning the documented type in the first place.

I'll document it as a Breaking change for now

[jules-ch]

CI is failing because of a problem on CircleCI I think. Pipeline needs to be triggered again.