Launch arguments support bool instead of string types only

[henningkayser]

The priorliy used string comparison would not work when passing proper bool types when including the launch file. This fix allows using both string and bool values.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 5.37%. Comparing base (1b121b7) to head (a216319).
⚠️ Report is 479 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1484      +/-   ##
========================================
+ Coverage   3.59%   5.37%   +1.78%     
========================================
  Files         13      33      +20     
  Lines        947    3239    +2292     
  Branches     152     391     +239     
========================================
+ Hits          34     174     +140     
- Misses       843    3063    +2220     
+ Partials      70       2      -68     

Flag	Coverage Δ
unittests	5.37% <ø> (+1.78%)	⬆️

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[urfeex]

That seems fair, thank you! The failing CI is unrelated to this, I'll open a separate PR fixing that. This one might have to wait until that one's merged.

[urfeex]

Hm, Kilted should be green except for binary/main. I'll check why it is not with this PR.

[urfeex]

I'm sorry to retract my approval. The method you proposed, seems to fail. When starting from the commandline:

ros2 launch ur_robot_driver ur5e.launch.py robot_ip:=192.168.56.101  use_mock_hardare:=False

The expression if use_mock_hardware.perform(context) seems to evaluate to True. That probably is, since use_mock_hardware is read as a string from the command line, probably because its default value is "false". However, if I make the default value a boolean False, the IfCondition(use_mock_hardware) fails with 'bool' object is not iterable.

I don't know how to resolve this for now.