live mode supported platforms

live mode seems to be working on >=11 https://github.com/async-profiler/async-profiler/blob/master/src/vmEntry.cpp#L140
need to verify it and not try to use it and warn user if it is not supported

Start by reading the linked async-profiler vmEntry.cpp code around line 140 and identify which platforms support live mode. Then trace how pyroscope-java selects live mode, verify behavior on supported and unsupported platforms, and confirm that unsupported use produces a warning instead of being attempted.

Written by the indexing model from the issue text.