Port before_v0.60/fuzzy, before_v0.60/ls-mods and before_v0.60/nu_101 (#845)

This PR is part of porting all old scripts #221 and includes a set of
modules:

- fuzzy -> `modules/fuzzy/fuzzy_command_search.nu`
- ls-mods -> `modules/ls-mods`: `ls-less.nu`, `ls-wide.nu` and
`ls-wide-with-color.nu`
- nu_101 -> `modules/nu_101`: `nothing.nu` and `inner_outer_loop.nu`

Edit: `fuzzy` and `nu_101` have been moved to `sourced`

modules/ls_mods/ls-wide.nu

@@ -0,0 +1,47 @@
+# A ls command that approximates the ls -sh command in bash
+export def ls-wide [
+    --path(-p):string # The path you want to list
+    --columns(-c):int # The number of columns in your output
+    ] {
+    let is_columns_empty = ($columns | is-empty)
+    let is_path_empty = ($path | is-empty)
+    let columns_default = 3
+
+    if $is_path_empty {
+        if $is_columns_empty {
+            run_ls "." $columns_default
+        } else {
+            run_ls "." $columns
+        }
+    } else {
+        if $is_columns_empty {
+            run_ls $path $columns_default
+        } else {
+            run_ls $path $columns
+        }
+    }
+}
+
+def run_ls [
+    path:string
+    columns:int
+    ] {
+    let max_fname_size = (ls $path | get name | into string | str length | math max)
+    let max_fsize_size = (ls $path | get size | into string | str length | math max)
+    let is_columns_empty = ($columns | is-empty)
+
+    ls $path | enumerate | each { |file|
+        let the_file = ($file.item.name | into string | fill -a l -c ' ' -w $max_fname_size)
+        let the_size = ($file.item.size | into string | fill -a r -c ' ' -w $max_fsize_size)
+        let new_line = (if $is_columns_empty {
+            if ($file.index + 1) mod 3 == 0 {
+                char newline
+            }
+        } else {
+            if ($file.index + 1) mod $columns == 0 {
+                char newline
+            }
+        })
+        $"($the_file) ($the_size) ($new_line)"
+    } | str join
+}