refactor: rest client

[NguyenHoangSon96]

Closes #

Proposed Changes

Briefly describe your proposed changes:

Checklist

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

[Copilot]

Pull request overview

This PR refactors the write path to use a new synchronous RestClient (urllib3-based) instead of the previous generated client/write service wiring, and updates InfluxDBClient3 construction accordingly.

Changes:

• Refactors WriteApi to issue HTTP requests via a new RestClient, adds gzip decision/compression utilities, and adds endpoint/exception translation logic.
• Introduces influxdb_client_3/write_client/_sync/rest_client.py to encapsulate urllib3 request/response handling.
• Updates InfluxDBClient3 initialization to pass write connection details (base_url/auth/gzip) directly into WriteApi.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 15 comments.

File	Description
influxdb_client_3/write_client/client/write_api.py	Major refactor of write implementation to use a new REST client and custom request building/serialization paths.
influxdb_client_3/write_client/_sync/rest_client.py	Adds a new urllib3-based synchronous REST client abstraction used by WriteApi.
influxdb_client_3/__init__.py	Wires new write API constructor parameters (auth/gzip/base_url) and updates public kwargs documentation.

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