Sort sessions by modification date in Telescope

[maxigaz]

It would be great if there was a way to sort sessions listed by the Telescope plugin by modification date, so that the session files in ~/.local/share/nvim/sessions saved or updated more recently would appear at the bottom. This would be especially useful when autosave is enabled in persisted.nvim.

[olimorris]

Great idea and happy to accept a PR for it