feat: skip calculating size for a folder if it takes too long

I have some cloud drives mounted using rclone and eza currently gets stuck when trying to calculate folder sizes using `--total-size`. So I suggest adding an option such that if size calculation takes too long for a folder, eza skip size calculation for that folder

eza v0.15.3
Termux 0.118.0 on Android 13

Start by locating the Rust implementation of `--total-size` and the folder-size calculation path. Determine how a configurable time limit could apply per folder, then add focused coverage for the timeout behavior and verify that normal size calculation still works.

Written by the indexing model from the issue text.