proxy-scanner chart should allow to create PVC for cache

[d-mankowski-synerise]

First logs on every proxy-scanner start look like this:

[WARNING]:   2024-04-28 17:35:44 - Error while loading cache file. Scanner will start with bootstap mode: open /opt/lacework/lacework_proxy_scanner_state.json.gz: no such file or directory
[ERROR]:   2024-04-28 17:35:44 - Error while loading cache. Running in bootstrap mode. open /opt/lacework/lacework_proxy_scanner_state.json.gz: no such file or directory

It would make sense to be able to create PVC (and add volume in the deployment) just for the cache, so it would be persistent across pod restarts