py: client: add logging

[isinyaaa]

Adds logging and additional keyword args to the Python client.
This also makes the custom_ca totally optional and not sourced by default by any means.

Logging settings can be further extended (e.g. with a prefix path for file logging) using other constructor flags.

Description

How Has This Been Tested?

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[tarilabs]

Thank you very much @isinyaaa !

/lgtm

I've added some comments for considerations; cc @lugi0

[tarilabs]

as discussed

/lgtm
/approve

[google-oss-prow]

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