File Transfer Rework continuation

Description

Following tasks

Code version identification

74fd0e1c

Current behavior

issue #2 on internal repo.
issue #1580 (closed)

Expected behavior

1. Re-organize the 2 samples of File Transfer (with and without wrapper).
2. Write tests for FT wrapper (toolkit_demo_server_file_transfer).

Security impact

None

Implementation

1. Create a folder named without_wrapper for older version (in samples and tests).
2. test_file_transfer: test client for toolkit_demo_server_file_transfer created and added to unit tests.

The next steps will be addressed in the ticket #1732