Add actionlib interface for basic Joint Group Command#60

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egordon wants to merge 3 commits intoros-controls:kinetic-develfrom

egordon:kinetic-devel

Commits on Jun 4, 2021

Add JointGroupCommand action
egordon
committed

Commits on Jun 5, 2021

Switch feedback to JointTrajectoryPoint, actually build the action file
egordon
committed

Commits on Aug 12, 2021

Made command type (i.e. position, velocity, effort) explicit
egordon
committed