Adding unimplemented TalismanManagerService, TalismanManager, and TalismanService

This is the basic skeleton of the TalismanManager and its associated classes, and the corresponding system API for obtaining and verifying talismans. See go/talisman-aosp for more details.

The implementation of these classes will follow in future changes.

Bug: 418280383
Test: N/A
Flag: NONE No-op. Flag to be added in next CL
Change-Id: Ica054673ff1388d5bc74b7de6ef523631c7206c6
BYPASS_LARGE_CHANGE_WARNING=mostly API definitions.