fix: async write prec where DEFAULT_PRECISION should not be used

[karel-rehor]

Closes #669

Proposed Changes

• set argument precision_from_point in internal _serialize method to True.
• detect WritePrecision key in resulting payload
• use the key to set precision argument in call to internal _write_service.post_write_async
• update test_write_points_different_precision to cover more current possible values

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)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.49%. Comparing base (28a4a04) to head (e679858).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #675      +/-   ##
==========================================
+ Coverage   90.47%   90.49%   +0.01%     
==========================================
  Files          40       40              
  Lines        3528     3534       +6     
==========================================
+ Hits         3192     3198       +6     
  Misses        336      336              

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[alespour]

LGTM

[bednar]

LGTM 🚀