fix(windows): allow to compile in a windows machine

[robertohuertasm]

What problem are you trying to solve?

While trying to compile the project in my Windows 11 machine I found out I was unable to compile the project due to some issues:

1. use of unix commands in build.rs
2. walkdir dependency mismatch

What is your solution?

1. I replaced the UNIX commands for Rust commands.
2. Updated Walkdir to 2.5.0, which is the latest version. For some reason, the version we had in Cargo.toml (2.3.3) didn't have the follow_root_links method that we're using in file_utils.rs. Not sure how, in Mac we're getting the right version (maybe through another dependency), but this is not true in Windows, so I decided to update the dependency.

Alternatives considered

What the reviewer should know

Tested this in a Windows 11 machine and it works.

RE #541

[jasonforal]

Nice, thanks for this!