Migrate to lazy.nvim

[fedemengo]

Opening up a 3k characters file takes 7 seconds

> time nvim --startuptime vim3k.nocache.log pi_3_000 +qall
nvim --startuptime vim3k.nocache.log pi_3_000 +qall  7.05s user 0.10s system 99% cpu 7.164 total

That's as bad as it gets. Lazy should help with performance and debugging

EDIT: fixed in neovim/neovim#23175

[fedemengo]

• https://github.com/datwaft/nvim.conf/blob/main/init.lua
• https://github.com/rhcher/Artorias/blob/main/fnl/dotfiles/plugin.fnl