Allow to exclude folders

We have a project, MyApp, with some internal packages, to which we split some app features. Features folder lays on the same level as other folders, like Services, etc.

MyApp

• Services
• Features
  • Shopping
    - ProtocolA
• Repositories

For the mockolo command I just provide whole path of parent folder, like MyApp, which includes both Services and Features. From what I see it's only allowed to exclude some specific files, (or filenames by suffixes). It would be really handy if we could exclude whole folder from the sources, lets say I provide MyApp as sources dir, but excluding dir would be MyApp/Features. And in general the idea is that every feature package will expose its own FeatureMocks package, so we need to skip generating them when running for whole mockolo target.

Start by locating the mockolo CLI option parsing and the existing file or filename-suffix exclusion handling. Add support for excluding a directory such as MyApp/Features while retaining current file exclusions, and verify that excluded folders are not processed for mock generation.