Add traclabs plansys2 backport via submodule, thanks @ana-GT

.gitmodules

@@ -1,3 +1,19 @@
 [submodule "isaac_msgs"]
 	path = communications/isaac_msgs
 	url = https://github.com/nasa/isaac_msgs.git
+[submodule "astrobee/survey_manager/survey_planner/src/ros2_planning_system"]
+	path = astrobee/survey_manager/survey_planner/src/ros2_planning_system
+	url = https://github.com/traclabs/ros2_planning_system.git
+	branch = noetic-devel
+[submodule "astrobee/survey_manager/survey_planner/src/ros1_lifecycle"]
+	path = astrobee/survey_manager/survey_planner/src/ros1_lifecycle
+	url = https://github.com/traclabs/ros1_lifecycle
+	branch = noetic-devel
+[submodule "ros1_lifecycle"]
+	path = ros1_lifecycle
+	url = https://github.com/traclabs/ros1_lifecycle
+	branch = noetic-devel
+[submodule "ros2_planning_system"]
+	path = ros2_planning_system
+	url = https://github.com/traclabs/ros2_planning_system.git
+	branch = noetic-devel

astrobee/survey_manager/survey_planner/readme.md

@@ -1,3 +1,5 @@
 \page survey_planner Survey Planner
 
-Planning and scheduling of queued survey actions.
+Planning and scheduling of queued survey actions using Playsys2 for PDPL solutions and behavior trees for execution.
+
+Based on [preliminary work](https://github.com/traclabs/astrobee_task_planning_ws) by [Ana](https://github.com/ana-GT) at [Traclabs](https://traclabs.com).

scripts/setup/packages_focal.lst

@@ -4,5 +4,6 @@ python3-osrf-pycommon
 python3-rosdep
 ros-noetic-eigen-conversions
 ros-noetic-pcl-ros
+ros-noetic-behaviortree-cpp-v3
 libmnl-dev
 libproj-dev