perf is not built with python script support

The "perf" tool supports python scripting to process events, this support is currently not enabled.

$ sudo perf script -g python
Python scripting not supported. Install libpython and rebuild perf to enable it.
For example:
  # apt-get install python-dev (ubuntu)
  # yum install python-devel (Fedora)
  etc.

The expected behaviour is that the script creates a template python file for you to modify to process the events.

From what I can see enabling this requires a few items
- We need to Build-Depend on python3-dev
- We would ship the perf-script-python binary
- There are various python modules (under tools/perf/scripts/python) needed for these to work
- There are also a number of upstream scripts (e.g. 'net_dropmonitor') we could ship, normally you can see those by running 'perf script -l' but we get "open(/usr/libexec/perf-core/scripts) failed. Check "PERF_EXEC_PATH" env to set scripts dir.". Expected output can be seen by running "PERF_EXEC_PATH=LINUX_SOURCE_PATH/tools/perf ./perf script -l"

While not important to me personally, it also doesn't have support for perl that could be fixed in a similar way, in case we want to fix that at the same time. It doesn't have as many pre-existing scripts though and seems less likely to be as useful compared to the Python version.

$ sudo perf script -g perl
Perl scripting not supported. Install libperl and rebuild perf to enable it.
For example:
  # apt-get install libperl-dev (ubuntu)
  # yum install 'perl(ExtUtils::Embed)' (Fedora)
  etc.