In [teuthology-api](https://github.com/ceph/teuthology-api) project, add a new endpoint which returns default values for teuthology-suite command options. Refer to teuthology-suite docs <https://docs.ceph.com/projects/teuthology/en/latest/commands/teuthology-suite.html> for possible default values. (This data would be used in future to populate default values for pulpito-ng's scheduling UI.) Reference: https://github.com/ceph/pulpito-ng/pull/23#issuecomment-1668555846