Implement the possibility to use FromPython to generate rotation and position in the python bindings

[GiulioRomualdi]

With this PR it is possible to use FromPython methods to covert a python array into a rotation/position

For instance thanks to this PR it will be possible to write the following code in python

transform = idyn.Transform()

transform.setRotation(idyn.Rotation.FromPython(base_rotation))
transform.setPosition(idyn.Position.FromPython(base_position))

Before this PR as far as I know the way to populate a transform object was this one

base_rotation_idyn = idyn.Rotation()
base_position_idyn = idyn.Position()
base_pose_idyn = idyn.Transform()

for i in range(0, 3):
    base_position_idyn.setVal(i, base_position[I])
    for j in range(0, 3):
        base_rotation_idyn.setVal(i, j, base_rotation[i, j])

base_pose_idyn.setRotation(base_rotation_idyn)
base_pose_idyn.setPosition(base_position_idyn)

[GiulioRomualdi]

Thanks to bccbbe4 it is now also possible to do

import idyntree.bindings as idyn
import numpy as np

T = idyn.Transform()
T.setRotation(np.eye(3))
T.setPosition([1,2,3])

p = idyn.Position([1,2,3])
R = idyn.Rotation(np.eye(3))

[traversaro]

Minor comment.

[traversaro]

Sorry, I did an error and squashed the commits even if they were correctly separated.