[Bug] Progress Bar for Globwalker

[sreedevk]

Describe the bug
While scanning deep directory trees, there's a small delay before the scanning files progress bar kicks in. For this period, deduplicator does not display any output. The goal is to add a ProgressBar::new_spinner() to make sure that the users can see that deduplicator is trying to traverse the directories to find files to process.

[sreedevk]

#42 Fixes this