Add LiftState.msg

[cardboardcode]

Purpose of Pull Request 📖

This is in regards to allowing better tracking of lift states for Kabam Robotics' applications which contain lift-taking capabilities.

Summary of Edits 🔖

• CMakelists.txt have been modified to add LiftState.msg
• LiftState.msg has been added under msg/ directory.

Verify ✔️

Due to current lack of Continuous Integration (CI) for this repository, please run the following commands for proof that the new modification does not break the current codebase:

1. Download the modified kabam_msgs ROS 1 package:

cd $HOME && git clone https://github.com/cardboardcode/kabam_msgs.git --depth 1 --branch feature/add_liftstate

2. Compile kabam_msgs using Docker:

docker run -it --rm \
    -v ./kabam_msgs:/catkin_ws/src/kabam_msgs \
ros:noetic-ros-base bash -c \
"cd /catkin_ws && source /ros_entrypoint.sh && catkin_make"

The ROS 1 package compiles successfully before exiting the docker container.