feat: native nvim vim.ui.select support

[ALameLlama]

Closes #72

Description

This adds support for the native nvim api vim.ui.select as a fall back if you don't have telescope installed. this should cover the majority of the pickers such as snacks, fzf and mini.

I created the picker-util since there was a lot of code duplication between telescope.lua and picker.lua, if you're not happy with this change I can revert it to my first commit which just added the basic fall back

Note

I've not done extensive testing with these changes, I was using a lazynvim repro.lua and enable/disable telescope/snacks and building a zig project and it seemed to be working fine

-- save as repro.lua
-- run with nvim -u repro.lua
-- DO NOT change the paths
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "runtime", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  -- stylua: ignore
  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", "--branch=stable",
    lazypath })
end
vim.opt.rtp:prepend(vim.env.LAZY or lazypath)

-- install plugins
local plugins = {
  { "AstroNvim/AstroNvim",             import = "astronvim.plugins" },
  { "AstroNvim/astrocommunity" },
  { import = "astrocommunity.pack.zig" },
  -- { import = "astrocommunity.fuzzy-finder.telescope-nvim" }, -- Enable this to swap to telescope instead of snames

  -- Add your local compiler.nvim for testing
  {
    dir = "/home/nciechanowski/Projects/compiler.nvim",
    name = "compiler.nvim",
    dependencies = { "stevearc/overseer.nvim" },
    config = function()
      require("compiler").setup()
    end,
  },

  -- add any other plugins/customizations here
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

-- add anything else here (autocommands, vim.filetype, etc.)

[ALameLlama]

@Zeioth is there anything I can do to move this along? would love to be able to use this with snacks