devtools: add script to check indentation of Meson lists

devtools: add script to check indentation of Meson lists

This is a script to fix up minor formatting issues in meson files.
It scans for, and can optionally fix, indentation issues and missing
trailing commas in the lists in meson.build files. It also detects,
and can fix, multi-line lists where more than one entry appears on a
line.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>