API review feedback changes

Made the follwing changes based on API council review
feedback

1. Made the class and its Builder class final
2. Removed methods that should not be in the builder
3. Changed the return type of available services
   from array to list.

Test: Unit tests
Bug 127657991

Merged-In: I3c2d406fed3ddaf62dee193c7657caf8c5bc13d2
Change-Id: I3c2d406fed3ddaf62dee193c7657caf8c5bc13d2
(cherry picked from commit 20d71403)