Enable python bindings compilation for human-dynamics-estimation if ROBOTOLOGY_USES_PYTHON is enabled

[traversaro]

Fix #1707 .

fyi @carloscp3009 @giotherobot @S-Dafarra

[traversaro]

Error:

-- Package robot-log-visualizer not found. Will be downloaded and built.
-- Package resolve-robotics-uri-py not found. Will be downloaded and built.
CMake Error at cmake/BuildHumanDynamicsEstimation.cmake:21:
  Parse error.  Expected a command name, got unquoted argument with text
  "//".
Call Stack (most recent call first):

[traversaro]

Error:

-- Package robot-log-visualizer not found. Will be downloaded and built.
-- Package resolve-robotics-uri-py not found. Will be downloaded and built.
CMake Error at cmake/BuildHumanDynamicsEstimation.cmake:21:
  Parse error.  Expected a command name, got unquoted argument with text
  "//".
Call Stack (most recent call first):

Great, I was using C++ comments in CMake. -_-

[traversaro]

This is failing with:

WARNING: Error parsing dependencies of hde: Invalid version: ''

[traversaro]

There is indeed a bug in CMake, that will be fixed in robotology/human-dynamics-estimation#398 .