[conan-center] Hooks regarding test_package and cpp_info

[jgsogo]

I'm proposing three hooks:

1. Every recipe should have a test_package folder (default name for Conan to run after conan create) (+info: Test other generators: run several tests in test_*/conanfile.py conan-center-index#8389). 🤔 Maybe it is already there.
2. If cpp_info contains .name or .filename, then (one of) the generators cmake_find_package[_multi] are expected
3. If cpp_info contains .set_property, then (one of) the generators CMakeDeps, MSBuildDeps, PkgConfigDeps are expected (maybe depending on the property).

Not really sure about the last two entries, not sure if we want (so) many packages with several test_xxxx folders.

[uilianries]

1. Every recipe should have a test_package folder (default name for Conan to run after conan create) (+info: [poc] Test other generators: run several tests in test_*/conanfile.py conan-center-index#8389). thinking Maybe it is already there.

Yes, the Hook 24: TEST PACKAGE FOLDER: https://github.com/conan-io/hooks/blob/master/hooks/conan-center.py#L248

[uilianries]

3. If cpp_info contains .set_property, then (one of) the generators CMakeDeps, MSBuildDeps, PkgConfigDeps are expected (maybe depending on the property).

We can not adopt it now. We are "migrating" recipes on CCI, supporting both cpp_info.names and set_property at same recipe to be prepared for 2.0, however, new generators are not used yet. We could think about a warning message to consider refactoring the recipe to new generators support.