fix: code style of source files

[bednar]

Proposed Changes

This PR enable CI check for source file code style checking.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

Attention: Patch coverage is 3.12500% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 2.11%. Comparing base (91e8b47) to head (f02e9ed).

Files	Patch %	Lines
influxdb_client_3/__init__.py	0.00%	12 Missing ⚠️
.../write_client/client/write/dataframe_serializer.py	0.00%	10 Missing ⚠️
influxdb_client_3/read_file.py	0.00%	3 Missing ⚠️
influxdb_client_3/write_client/client/_base.py	0.00%	3 Missing ⚠️
influxdb_client_3/write_client/client/write_api.py	0.00%	2 Missing ⚠️
influxdb_client_3/write_client/_sync/api_client.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #80   +/-   ##
=====================================
  Coverage   2.11%   2.11%           
=====================================
  Files         34      34           
  Lines       2083    2080    -3     
=====================================
  Hits          44      44           
+ Misses      2039    2036    -3     

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[bednar]

@karel-rehor, the Codecov report isn't applicable in this case due to the refactoring of the file styles.

[karel-rehor]

Ran this example against an initial user account - it eventually resulted in the following error

The retriable error occurred during request. Reason: 'org fbb67cd4c8905be6 has exceeded limited_write plan limit'. Retry in 206s.

While a good example of batching, I'm not sure from perhaps a marketing perspective, if it is a good example for newer users.

[bednar]

This issue should be addressed by #82

[karel-rehor]

Tried this example as well against a new user account. Apparently the "flight2" bucket needs to be created in another example.

Failed with error

pyarrow.lib.ArrowInvalid: Flight returned invalid argument error, with message: bucket "flight2" not found. gRPC client debug context: UNKNOWN:Error received from peer ipv4:34.196.233.7:443 {created_time:"2024-04-05T10:59:19.006603056+02:00", grpc_status:3, grpc_message:"bucket \"flight2\" not found"}. Client context: IOError: Server never sent a data message. Detail: Internal

[bednar]

This issue should be addressed by #82

[karel-rehor]

• Tests pass. Could be more of them.
• Linter (flake8) passes.
• Tried running a few examples but they have issues.
  • Not self contained - some expect a prepared database state
  • One exceeded limits for introductory account
  • Some use outdated API, which has been refactored
  • Still with a few changes they can be executed
  • For these issues Enhancement Request examples: general review and restructuring of examples  #82 has been opened

Since this PR is basically about standardizing code style and removing detritus like unused import statements, it should not be necessary to address issues with examples here.

Good to go.