Start implementation of cmake-file-api support

Before long, upstream cmake will remove the server support. Instead,
the new cmake-file-api is supposed to be used. This patch adds the
first baby steps towards that goal. We now write a query file to
the required location before running the cmake configure job. Then
we can look for the latest available index reply file that belongs
to our client request.

See:
https://cmake.org/cmake/help/latest/manual/cmake-file-api.7.html

CCBUG: 417202