Inconsistent Environment Variable Support Between Go v3 and Python v3 Clients

[bednar]

The InfluxDB v3 Python client does not provide the same environment variable configuration options as the GO v3 client. This inconsistency complicates setting up multiple clients in the same environment since certain parameters cannot be configured uniformly through environment variables. Expanding or aligning the Python client’s environment variable support to match the Go client would greatly simplify deployment and configuration in mixed-language environments.

It should be backward compatible, so we will have to support both - new and also old sys env naming.