sanitycheck: Use the C LibYAML parser if available

Use the C LibYAML parser if available, rather than the Python parser. It
is much faster.

This is a clean and rebased version of PR #20210 by
Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

Co-authored-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2 files changed