Adding sample unit tests to SamplePackage example for swift wrapper to show case the usage w.r.t unit tests

[absaroj]

Adding sample unit tests to SamplePackage example for swift wrapper to show case the usage w.r.t unit tests.

Added dependency to the objC moduel for UT target and added required libs and fwks to be linked to the build target.

Testing:

• Swift build and test passing
• Sample test is passing