feat: Add CLI

[TheTrueAI]

Proposed Changes

Developers and AI tooling need a simple, scriptable query command for fast feedback during development. Existing community Python CLI seems unmaintained and not aligned with current behavior. So this PR introduces the following:

• Adds a new influx3 query CLI path for read/query workflows.
• Supports SQL and InfluxQL queries with JSON, JSONL, CSV, and pretty output formats.
• Adds module entrypoint support so the CLI can also be run through python -m influxdb_client_3.
• Fixes Windows-specific PEM newline handling for Flight query TLS root certificates.

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)

[bednar]

@TheTrueAI thanks for the PR. There is already an existing CLI tool: https://docs.influxdata.com/influxdb3/core/reference/cli/influxdb3/. What’s the reason for creating a new one in the Python v3 client?

[TheTrueAI]

Good point — the official influxdb3 query CLI does cover the same query functionality. My motivation was zero-install in Python environments: pip install influxdb3-python gives you the CLI inside the venv with no separate binary needed. This is useful for Python-centric CI and AI agent workflows where adding system binaries is friction.

Happy to scope this down or close if you feel the overlap isn't justified.