FDB should use dependency provider in CMake

See:

https://cmake.org/cmake/help/latest/command/cmake_language.html#set-dependency-provider

Start by reading the linked CMake documentation for set-dependency-provider, then inspect FoundationDB's CMake configuration to identify how dependencies are currently resolved. Done means the build uses the dependency-provider mechanism without losing existing dependency behavior; the issue does not name specific files or tests.

Written by the indexing model from the issue text.