[style] Add a mode for all cmake messages

For cmake consistency, set the mode parameter for all cmake messages that currently lack one.

Example:

-- Lidar SLAM : using OpenMP 4.5 target
Lidar SLAM : G2O was found, pose graph API compiled
Lidar SLAM : GTSAM was found, IMU preintegration compiled
Lidar SLAM : TEASER++ was found, automatic loop closure detection enabledd
-- Configuring done (0.6s)
-- Generating done (0.0s)

becomes

-- Lidar SLAM : using OpenMP 4.5 target
-- Lidar SLAM : G2O was found, pose graph API compiled
-- Lidar SLAM : GTSAM was found, IMU preintegration compiled
-- Lidar SLAM : TEASER++ was found, automatic loop closure detection enabledd
-- Configuring done (0.6s)
-- Generating done (0.0s)