[validation] report progress when reconciling projects #984
Description
The language server should report progress when reconciling full projects, especially when reconciling all the projects in the workspace after startup - to inform the user what is going on behind the scenes.
Otherwise, it is somewhat unclear to users what is going on when they (more or less) see nothing happening in the IDE, but the CPU of the language server process is constantly busy for as long as the initial reconciling is running.