[FEATURE]save the lsp workspace folders environment variable

Is your feature request related to a problem? Please describe.

-- add path environment variable
vim.lsp.buf.add_workspace_folder

recovering after calling the SessionSave command did not recover the lsp workspace

Describe the solution you'd like
Run vim.lsp.buf.add_workspace_folder to see the previously added workspace

Describe alternatives you've considered
by pre_ save and SessionRestore

Additional context

1. nvim demo/
2. vim.lsp.buf.add_workspace_folder()
3. vim.inspect(vim.lsp.buf.list_workspace_folders())
4. exit nvim
5. nvim demo/
6. :SessionRestore
7. vim.inspect(vim.lsp.buf.list_workspace_folders())

[rmagatti]

Does it get saved if you manually rum mksess to create a session and manually restore it after?
What gets saved in the session is up to upstream Neovim and its available options. auto-session does not have control or implement extras on top of Neovim's supported session saving features.