Bluetooth Finder: Interface for Bluetooth Finder and Freeze the AIDL API

This allows NearbyService, which depends on this API, to be merged from git_main to udc-mainline-prod. Only the API is merged, without VTS and default implementation since this is a V+ feature.

Bug: 307897939
Test: m android.hardware.bluetooth.finder-update-api
Merged-In: I111b9e20831c094dcb42432e9d83f9fd326ff953
Change-Id: I111b9e20831c094dcb42432e9d83f9fd326ff953
(cherry picked from commit 36556927)