CMakeDeps should use the module file name to create Find<pkg>.cmake variables

[czoido]

CMakeDeps is creating some variables in module mode using the name of the package. Instead of that, using the file name is probably more expected. Now, for example, for libcurl, it would generate libcurl_FOUND and libcurl_VERSION. Probably CURL_FOUND and CURL_VERSION is a bit more expected (but not perfect). As commented in the linked discussion, it's impossible for Conan to address all the cases for the declared variables in the official CMake modules, but at least we can try to provide those.

Related to: conan-io/conan-center-index#8294 (comment)
and: conan-io/conan-center-index#8425 (comment)

[SpaceIm]

What about <name>_LIBRARIES and <name>_INCLUDE_DIRS? They were available in cmake_find_package but I don't see these variables in Find files generated by CMakeDeps when cmake_find_mode is both.
It's important for proper emulation of official Find files.