Logs report information not useful to end users at the `INFO` level

Much of the internal workings of the API client are reported at the `INFO` log level, which isn't appropriate for a library. A user-facing script or app should report only when it does something that it's expected to do at the `INFO` level, but if their code uses `logging.basicConfig(level=logging.INFO)` then `jellyfin-apiclient-python` reports various internal workings to the end user at the `INFO` level such as sent requests.

As a library, almost all, if not all, `logging.info(...)` calls should be changed to `logging.debug(...)`.

Search the repository for logging.info(...) calls and review which messages describe internal API-client workings, such as sent requests. Check the logging behavior with logging.basicConfig(level=logging.INFO); done means internal messages no longer appear at INFO while genuinely user-facing INFO messages remain.

Written by the indexing model from the issue text.