Add Stdin-filename arg to Reek linter

[guzart]

Passes an --stdin-filename argument to Reek when linting files.

This gives Reek context about the piped contents and supports using the directories configuration.

Caveat:
Because this change sends the absolute path to the file, the configuration in directories must be prefixed with ** for it to work. e.g.

directories:
  '**/app/controllers':
    IrresponsibleModule:
      enabled: false

[minkir014]

When this PR will be merged???

[leonelgalan]

Caveat:
Because this change sends the absolute path to the file, the configuration in directories must be prefixed with ** for it to work. e.g.

Because of this change and before I add the ** the linter from the extension will show smells that won't show when I run:

bundle exec reek folder/file.rb

If I prefix directories with ** as suggested, the smells don't show on vscode-ruby, but show up when I run reek on it's own, or through CodeClimate.

Possible Solution

For future readers, configuring the directory directive as shown, seems to work with both the reek command line tool and vscode-ruby:

directories:
  "folder|**/folder":
    UtilityFunction:
      enabled: false

It's not ideal to have to repeat the folder name twice, but at least this allows both tools to use the same configuration. My own caveat: the documentation and and the tests say a Dir.glob (like) pattern can be used, but ultimately a Regex is used, which is why | appears to work.