Add support for name field for plugins (as does not work anymore) and modularisation guide when using plugins folder and separate plugin .lua files inside of it

[Emcho0]

Anyone who wants to migrate from packer.nvim to pckr.nvim has encountered an issue where the aliased plugin name won't show up:

{ "catppuccin/nvim", as = "catppuccin" }

A more intuitive and readable approach would be to use a name field, similar to how packer.nvim allowed aliasing:

require("pckr").add {
    {
        "catppuccin/nvim",
        name = "catppuccin"
        -- config options for the plugin
    };
    -- other plugins
}

This would improve readability and make it easier for users switching from packer.nvim to pckr.nvim.

And besides that, I think that there should be an ability in require('pckr').add to have inside of it require('path_to_plugin_spec_folder') folder or similar so that it can load each and every plugin .lua file inside of that folder.

Example code snippet:

require("pckr").add {
    require("path_to_plugin_spec_folder") 
    -- or
    "path_to_plugin_spec_folder"
}

This would improve the modularity of each and every plugin .lua file, and would have the similar spec when declaring it without a plugin folder.