feat: delete_api also accept datetime as a value for start and stop

[bednar]

Closes #313

Proposed Changes

The use can use datetime without timezone as a parameter for delete_api.

Checklist

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

[codecov-commenter]

Codecov Report

Merging #317 (60ac161) into master (8539a9b) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
+ Coverage   92.52%   92.54%   +0.02%     
==========================================
  Files          27       27              
  Lines        2220     2226       +6     
==========================================
+ Hits         2054     2060       +6     
  Misses        166      166              

Impacted Files	Coverage Δ
influxdb_client/client/delete_api.py	100.00% <100.00%> (ø)

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