Make system default durability volatile #492
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This PR updates the system default durability to volatile from transient_local. This change is the better align with QoS settings in other RMWs #485. While rmw_zenoh does not necessarily have to conform to other RMW settings but the durability, and particularly setting to transient_local by default, might lead to unintended behavior in tests and applications that users might have developed. So it makes sense to switch to volatile by default.
I've ran the usual CI tests and didn't see any new regressions. (rclpy/test_logging is flaky).
cc: @JEnoch @YuanYuYuan