feat(tmux): added configuration option for autoclosing terminals

This commit adds a config option so that if the user wants to close all
tmux terminals opened by harpoon on Vim exit, they can.

lua/harpoon/init.lua

@@ -157,6 +157,7 @@ M.setup = function(config)
             ["save_on_toggle"] = false,
             ["save_on_change"] = true,
             ["enter_on_sendcmd"] = false,
+            ["tmux_autoclose_windows"] = false,
         },
     }, expand_dir(
         c_config

lua/harpoon/tmux.lua

@@ -6,6 +6,14 @@ local utils = require("harpoon.utils")
 local M = {}
 local tmux_windows = {}
 
+if global_config.tmux_autoclose_windows then
+    vim.cmd([[
+        augroup HARPOON_TMUX
+        autocmd!
+        autocmd VimLeave * :lua require('harpoon.tmux').clear_all()
+    ]])
+end
+
 local function create_terminal()
     log.trace("tmux: _create_terminal())")