Implement continuous profiling

[ahamlat]

Description

As an Besu user, I want to have continuous profiling so that we can get profiling data when needed. This can help to troubleshoot some performance issue especially those related to CPU usage.

Expected behavior: [What you expect to happen]
Besu should run in the backhground a profiler (without restarting besu)

Actual behavior: [What actually happens]
There is no continuous profiling, we can still do profiling but we need to restart Besu.