perf tools: Add new perf data command

Adding new 'perf data' command to provide operations over
data files.

The 'perf data convert' sub command is coming in following
patch, but there's possibility for other useful commands
like 'perf data ls' (to display perf data file in directory
in ls style).

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
6 files changed