Add get_data_by_id method in DataObject

[GuillemBarroso]

Description of the feature

This PR includes an example on how to retrieve data from a field by ID.

In Post this feature can be exposed as a method of DataObject, so the users could:

1. Retrieve all the data with its associated IDs

   simulation = post.load_simulation("my_example")
   my_named_selection = "test"
   my_selection = select(named_selection=my_named_selection)
   nodal_ids, nodal_disp = simulation.displacement(select=my_selection).get_data_by_id()
   assert len(nodal_ids) == len(nodal_disp) == n_nodes
   assert type(nodal_ids) == np.ndarray or ints
   assert type(nodal_disp) == np.ndarray of floats

2. Retrieve data for one ID

   simulation = post.load_simulation("my_example")
   my_named_selection = "test"
   my_selection = select(named_selection=my_named_selection)
   nodal_id, nodal_disp = simulation.displacement(select=my_selection).get_data_by_id(5)
   assert len(nodal_id) == len(nodal_disp) == 1
   assert type(nodal_id) == np.array of ints
   assert type(nodal_disp) == np.array of floats # (containing the three components of the displacement for that node)

3. Retrieve data for a list of IDs

   simulation = post.load_simulation("my_example")
   my_named_selection = "test"
   my_selection = select(named_selection=my_named_selection)
   nodal_ids, nodal_disp = simulation.displacement(select=my_selection).get_data_by_id([1, 5, 25])
   assert len(nodal_ids) == len(nodal_disp) == 3
   assert type(nodal_ids) == np.array of ints
   assert type(nodal_disp) == np.array of floats

Steps for implementing the feature

Implement the get_data_by_id() method in the data object.

Make only one server call to increase performance.

Useful links and references

N/A

[PProfizi]

Closing as stale for now. To reopen later.