Retrival of private datasets with access-tokens | Clean up of some function names

See merge request !2

The change is needed because the name of the directory changed from
'rdf_test' to 'fst_rdf_utilities__python_package'.

Implement the get_rdf_private_datasets_with_access_token feature

See merge request fst-tuda/projects/designing-with-fluids/hydropulser/fst-rdf-utilities!1

Implement inside the 'retrieveRDFDatast(...)' matlab_wrapper function that it also can be used with a optional config_file_path for the access token

Add the 'EXAMPLE.config.json' file to the '.gitignore' file that the users wont accidently commit their access tokens to the version control

Refactor the cli.py by reordering the code lines into functions and add a tests file to be able to test the cli.py file properly

Update the 'parse_online_RDF_to_dict(...)'  function that it works with the new return variables of the 'load_git_rdf(...)' function

Implement inside the 'follow_all_redirects' function that it tries to detect a login site (private files) and return the last URL that was called that redirected to the login site

Rewrite the function that gets the version_commit_hash to work with the access_token and also return the rdf_content

Move the code that checks on which gitlab service instance the file resides in a own function 'get_git_instance_service(...)'

Move the http(s) requests code for the redirects from the 'load_git_rdf(...)' function into a own function called 'follow_all_redirects(...)'

Add a test to test the 'retrieve_rdf_dataset.m' function and fix the files in this new repository that the test succeds

Move the python package and matlab wrapper one directory upwards since the additional directory layer isn't needed

Initial commit of the rdf_utilities extracted from the FST_ASAM_XIL_API repository to get a better modularization