Consolidate directory scanning packages

[rprieto]

Thumbsup uses 3 packages for reading the file system:

package	used in	usage complexity	last package version
readdir-enhanced	the main scanning logic	complex glob patterns, ignore lists and optimisations	3 years ago
fs-readdir-recursive	the cleanup routine	simple (read all files)	6 years ago
glob	integration tests	simple (read all files)	2 months ago

We could consolidate to a single solution to reduce the number of dependencies. Glob is the only one of the 3 that seems actively maintained. It seems to support all the advanced features Thumbsup uses (filtering, early pruning, etc). We would need to carefully assess performance and memory usage.

Node.js also added recursive functionality to fs.readdirSync recently, but it requires a recent version (> 18.17) and doesn't offer all the required features. It could still be a replacement for the last 2 use cases once it's stabilized.