Unused imported modules

[wgrabowski]

Add new command for checking if for given module class anything from what this module import is used in this module files.

• for given module class get all imported modules (that are not from node_modules, since source code is analyzed)
• for each imported module get its exports and providers
• for each exported and provided class from imported modules look for usages in analyzed module declarations and providers

[jtc10005]

This would be great.