profile gls binary with pprof to spot bottlenecks in runtime

[ozansz]

Summary

Folder indexing (tree traversal) seems to be inefficient than it should be, considering it's basically a tree traversal algorithm.
Use pprof tool to find out if there are any bottlenecks in the code, by either:

1. Writing a benchmark test and running it with the -benchmem, -memprofile, and -cpuprofile options
2. Setting up a pprof server by using net/http/pprof, and calling it during runtime to capture the CPU/memory dumps