feat: add --no-check option (#6456)

This commit adds a "--no-check" option to following subcommands:
- "deno cache"
- "deno info"
- "deno run"
- "deno test"

The "--no-check" options allows to skip type checking step and instead 
directly transpiles TS sources to JS sources. 

This solution uses `ts.transpileModule()` API and is just an interim
solution before implementing it fully in Rust.

cli/js/files.ts

@@ -1,6 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
-import {
+import type {
   Reader,
   Writer,
   Seeker,
@@ -19,7 +19,7 @@ import {
   openSync as opOpenSync,
   OpenOptions,
 } from "./ops/fs/open.ts";
-export { OpenOptions } from "./ops/fs/open.ts";
+export type { OpenOptions } from "./ops/fs/open.ts";
 
 export function openSync(
   path: string | URL,