Fix compilation against latest YARP master branch

[traversaro]

In robotology-superbuild CI, we have problems with the idl generated files by some old YARP version when compiling with YARP 3.7 (or what will become YARP 3.7). To avoid the problem at the root, I switched to generate the idl files at each build (instead of committing them manually) and I removed the autogenerated files that at the moment were committed in the repo. This was done by just generating the idl files in the build directory instead of the source directory.

See robotology/robotology-superbuild#1000 .

[traversaro]

Indeed, the CI fails with:

[  7%] Building CXX object thrift/worldinterface/CMakeFiles/gazebo_yarp_rpc_worldinterface.dir/autogenerated/src/WorldInterfaceServer.cpp.o
/home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/thrift/worldinterface/autogenerated/src/WorldInterfaceServer.cpp: In member function ‘virtual bool GazeboYarpPlugins::WorldInterfaceServer_getList_helper::read(yarp::os::ConnectionReader&)’:
/home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/thrift/worldinterface/autogenerated/src/WorldInterfaceServer.cpp:865:41: error: cannot bind non-const lvalue reference of type ‘size_t& {aka long unsigned int&}’ to an rvalue of type ‘size_t {aka long unsigned int}’
     reader.readListBegin(_etype3, _size0);
                                         ^
In file included from /home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/install/include/yarp/os/idl/BareStyle.h:10:0,
                 from /home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/install/include/yarp/os/idl/WireTypes.h:19,
                 from /home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/thrift/worldinterface/autogenerated/include/GazeboYarpPlugins/WorldInterfaceServer.h:15,
                 from /home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/thrift/worldinterface/autogenerated/src/WorldInterfaceServer.cpp:11:
/home/runner/work/gazebo-yarp-plugins/gazebo-yarp-plugins/install/include/yarp/os/idl/WireReader.h:194:10: note:   initializing argument 2 of ‘void yarp::os::idl::WireReader::readListBegin(yarp::os::idl::WireState&, size_t&)’
     void readListBegin(yarp::os::idl::WireState& nstate, size_t& len);
          ^~~~~~~~~~~~~
make[2]: *** [thrift/worldinterface/CMakeFiles/gazebo_yarp_rpc_worldinterface.dir/autogenerated/src/WorldInterfaceServer.cpp.o] Error 1
thrift/worldinterface/CMakeFiles/gazebo_yarp_rpc_worldinterface.dir/build.make:103: recipe for target 'thrift/worldinterface/CMakeFiles/gazebo_yarp_rpc_worldinterface.dir/autogenerated/src/WorldInterfaceServer.cpp.o' failed
make[1]: *** [thrift/worldinterface/CMakeFiles/gazebo_yarp_rpc_worldinterface.dir/all] Error 2
make: *** [all] Error 2
CMakeFiles/Makefile2:766: recipe for target 'thrift/worldinterface/CMakeFiles/gazebo_yarp_rpc_worldinterface.dir/all' failed
Makefile:145: recipe for target 'all' failed