Enabling java profiling in rootless mode

[rsiyer-intel]

Current rootless mode support is limited to perf profiling.
We would like gprofiler to be able to run java profiling in rootless mode.

• It needs to support rootless java profiling
• it needs to support rootless java profiling from within a container i.e. gprofiler is run within a non-privileged container and it should be able to profile the java application running inside it.
  @mlim19

[rsiyer-intel]

Additional notes here on previous discussion on rootless mode -
#905 (comment)
#905 (comment)