feature: add on_open and on_close function hook in setup options.

[chaozwn]

hi, theniceboy. i need remove some keymaps in maps.t table.
can you add on_open and on_close function in default setup?

[theniceboy]

Can you elaborate a little please? I'm not sure what the maps.t table is. Thanks

[chaozwn]

sorry, i means like toggleterm. such as below png.