Bug: Logs are available between sessions and persistent logs are deleted after 30 days

[andreped]

In streamlit it is possible to store session-dependent variables using st.session_state. Sadly, Gradio don't have an identical method for this. This we would need to be able to keep logs separate between users. Currently, all users read from the same file lying in the container itself.

[andreped]

This issue was also reported in another project with the same implementation:
raidionics/AeroPath#42

Same fix here should be applied there.