[Bug] The functionality that is supposed to be unstable is not tagged as such.

[DenisBiryukov91]

Describe the bug

Liveliness and Querier functionality is considered to be unstable in zenoh ecosystem.
It should be tagged appropriately in python, to at least inform users that the corresponding APIs can be changed in the future.

To reproduce

check the docs

System info

Any

[DenisBiryukov91]

Resolved by #404