Use some kind of versioning for conan_provider.cmake

[czoido]

Hi!
I think it would be beneficial to have a way to check the current version of conan_provider.cmake. This idea stems from the fact that as more features get added to the provider (e.g., setting profiles), we should increase visibility for users of the conan-clion-plugin. Specifically, we should display the plugin version in the UI. Doing so would allow us to assist users who might be trying to use features incompatible with their current provider version and suggest updates. If we're not releasing new plugin versions, perhaps a comment in the code could suffice?
Thanks a lot!