rclnodejs v0.21.2

This is the first version of rclnodejs starts to support ROS 2 Humble Hawksbill

Bug Fix

We fixed several known issues in this release, special thanks to @wayneparrott @ejalaa12 @imcelroy for their great contributions!

• bool and bool_array should not be converted to strings in parameter msg #850
• Client only saves one callback at a time #858
• Accomodate TS 4.7's new union order in dtslint tests #847
• Fix issues when using parameters of type array #855

CI improvement

We dropped the previous CI used for Linux/Windows/macOS platforms and migrated to Actions with Humble support, thanks for @wayneparrott 's effort to make it happen!

• humble port #853
• Replace appveyor with Github action/workflow for Windows builds #854
• Remove cases that depends on test/rclnodejs_test_msgs under \test #856