What has been done:
- TT#40529, Implement API method for assigning a destination to a specific speed dial slot
- TT#40630, Implement API method for fetching available slots
- TT#40530, Implement reload of list after new assignment has been created successfully
- TT#40527, Implement UI form and buttons (destination input field, slot selection field, and add button)
- TT#40528, Implement custom phone number input field with automated formatting
- TT#40531, Implement toast for successfully assigned destination
- TT#40538, Implement unit test for creation of selections options for speed dial slot selection
Change-Id: Ibe4937a097be0a89e677916a189a0e3fe62826df