Fix floating_point_range numerical values

[christophfroehlich]

Fixes error on humble like

- generate_parameter_module_example.test.test_params_consistency.TestParamsConsistency test_use_feedforward_commanded_input
  <<< failure message
    AssertionError: The 'to_value' field must be of type 'float'
  >>>

From Iron on, the assertions are disabled per default: https://docs.ros.org/en/rolling/Releases/Release-Iron-Irwini.html#optional-argument-that-hides-assertions-for-messages-class

Question is: Should we instead harden the behavior and wrap the values in a float()?

[saikishor]

Looks fine to me.

In ROS 1, the params used to auto cast automatically, I don't know if we should do the same here, but I'm okay with this change