feat: add telescope extension

[Parsifa1]

can be used after require("telescope").load_extension "session_manager"
just :Telescope session_manager

[Shatur]

But why? You can just install https://github.com/nvim-telescope/telescope-ui-select.nvim

[Parsifa1]

you are right, but maybe someone wants to use telescope?
anyway, It's up to you.

[Shatur]

The plugin above utilizes telescope automatically. You just do :SessionManager load_session.