feat(tmux): add fish completions

modules/programs/tmux/tmux-sessionizer/script.fish

@@ -0,0 +1,13 @@
+set selected (fd -HIg '.git' ~/ --min-depth 1 --max-depth 5 --type d --prune --exec dirname {} | fzf1 $argv)
+
+set selected_name (basename $selected 2>/dev/null | string replace "." "_")
+
+if not test -n "$selected_name"
+  exit 1
+end
+
+if ! tmux has-session -t $selected_name 2> /dev/null
+  tmux new-session -ds $selected_name -c $selected
+end
+
+tmux-switch $selected_name