Add neotest

[Proteusiq]

return {
  "nvim-neotest/neotest",
  dependencies = {
    "nvim-neotest/nvim-nio",
    "nvim-lua/plenary.nvim",
    "antoinemadec/FixCursorHold.nvim",
    "nvim-treesitter/nvim-treesitter"
  }
}