cmake: allow to include extra dependencies

Tarantool EE needs to build or find some extra libraries. Let's add
the new variable EXTRA_DEPENDENCIES_CMAKE for that. It'll be defined
by the parent project.

Since we might need to link the extra dependencies to the core library,
we also add the new list variable EXTRA_CORE_DEPENDENCIES. If set, its
contents will be appended to the core library dependencies list.

Follow-up #9242

NO_DOC=build
NO_TEST=build
NO_CHANGELOG=build

(cherry picked from commit a367265b)