Need to add check to make sure gdb/gcore is available.

[MarioHewardt]

If you install procdump via package manager dependencies ensure that gdb is installed. However if you build procdump and gdb is not installed it will loop forever with the below output:

Press Ctrl-C to end monitoring without terminating the process. [18:16:32 - INFO]: Timed: [18:16:42 - INFO]: Timed: [18:16:52 - INFO]: Timed: [18:17:02 - INFO]: Timed: [18:17:12 - INFO]: Timed: [18:17:22 - INFO]: Timed: [18:17:32 - INFO]: Timed:

Need to add check and exit gracefully if gdb is not installed (for non .net core 3 processes).