Completed basic lazy migration

nvim/lua/plugin-config/tmp-old-packer-configs/lsp-installer.lua

@@ -0,0 +1,16 @@
+local lsp_installer = require("nvim-lsp-installer")
+
+-- Register a handler that will be called for all installed servers.
+-- Alternatively, you may also register handlers on specific server instances instead (see example below).
+lsp_installer.on_server_ready(function(server)
+    local opts = {}
+
+    -- (optional) Customize the options passed to the server
+    -- if server.name == "tsserver" then
+    --     opts.root_dir = function() ... end
+    -- end
+
+    -- This setup() function is exactly the same as lspconfig's setup function.
+    -- Refer to https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
+    server:setup(opts)
+end)