fix(tsserver): improve performance

ref: sublimelsp/LSP-typescript#129

```
 narrowed down my LSP-TypeScript slowness issues to the autocomplete,
 namely that there were a ton of suggestions populating the results in
 one of my large monorepo projects.
 Adding this to my LSP-typescript.sublime-settings has helped
 tremendously:

{
	"initializationOptions": {
		"preferences": {
			"includeCompletionsForModuleExports": false
		}
	}
}
````

lua/config/lsp/clients.lua

@@ -70,6 +70,12 @@ require("typescript").setup({
     disable_commands = false,
     debug = false,
     server = {
+        init_options = {
+            hostInfo = 'neovim',
+            preferences = {
+                includeCompletionsForModuleExports = false
+            },
+        },
         on_attach = function(client, bufnr)
             lsputils.default_on_attach(client, bufnr)
             keymap.set(