Add quick fix to export unexported members to fix unresolved symbol errors

## Search Terms import export unexported symbols auto import completion global globals intellisense ## Suggestion tsserver can auto-complete exported symbols from other modules, and add an import statement that imports the symbol you selected. It should also suggest **global symbols** from other modules that are ***not* exported**, and add the *export* keyword if the suggestion is selected. ## Use Cases When I write a module I can't predict every use case of it, and I only export the global symbols that I think other modules would need to use. But when I'm working on a different module and I realize I want to use a symbol which is not exported by the other module (or maybe I don't even remember if it is or isn't exported), I would like my editor to export and import it for me instead of me having to find that symbol manually (because even go-to definition won't work) and export it, and then go back and auto-complete to auto-import. This is also very very **very** useful when converting a web project to use imports. You can just go over all of the "undeclared symbol" errors and auto-complete to export and import the correct symbol. ## Examples *module.ts*: ```ts function foo(name = 'World') { console.log('Hello ' + name); } export function bar() { foo(); } ``` *app.ts*: ```ts import { bar } from './module.ts'; bar(); ``` I now want to customize the "hello" message, so I start typing `foo` and then wait for completion suggestions which include the function `foo` from `module.ts`. After selecting that, the symbol `foo` is automatically exported and imported for me, and I can use it immediately: *module.ts*: ```ts export function foo(name = 'World') { console.log('Hello ' + name); } export function bar() { foo(); } ``` *app.ts*: ```ts import { bar, foo } from './module.ts'; bar(); foo('TypeScript'); ``` ## Checklist My suggestion meets these guidelines: * [X] This wouldn't be a breaking change in existing TypeScript/JavaScript code * [X] This wouldn't change the…