Reduce size of TypeScript Compiler snapshot (#6809)

This PR is intentionally ugly. It duplicates all of the code in cli/js2/ into
cli/tsc/  ... because it's very important that we all understand that this code
is unnecessarily duplicated in our binary. I hope this ugliness provides the
motivation to clean it up.

The typescript git submodule is removed, because it's a very large repo and
contains all sorts of stuff we don't need. Instead the necessary files are
copied directly into the deno repo. Hence +200k lines.

COMPILER_SNAPSHOT.bin size
```
master         3448139
this branch    3320972
```

Fixes #6812

1 files changed, 0 insertions, 43 deletions

diff --git a/cli/js2/lib.deno.worker.d.ts b/cli/js2/lib.deno.worker.d.ts
deleted file mode 100644
index 95aa16139..000000000
--- a/cli/js2/lib.deno.worker.d.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-
-/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any */
-
-/// <reference no-default-lib="true" />
-/// <reference lib="deno.ns" />
-/// <reference lib="deno.shared_globals" />
-/// <reference lib="esnext" />
-
-declare interface DedicatedWorkerGlobalScope {
-  self: DedicatedWorkerGlobalScope & typeof globalThis;
-  onmessage: (e: MessageEvent) => void;
-  onmessageerror: (e: MessageEvent) => void;
-  onerror: undefined | typeof onerror;
-  name: typeof __workerMain.name;
-  close: typeof __workerMain.close;
-  postMessage: typeof __workerMain.postMessage;
-  Deno: typeof Deno;
-}
-
-declare const self: DedicatedWorkerGlobalScope & typeof globalThis;
-declare let onmessage: ((e: { data: any }) => Promise<void> | void) | undefined;
-declare let onerror:
-  | ((
-    msg: string,
-    source: string,
-    lineno: number,
-    colno: number,
-    e: Event,
-  ) => boolean | void)
-  | undefined;
-declare const close: typeof __workerMain.close;
-declare const name: typeof __workerMain.name;
-declare const postMessage: typeof __workerMain.postMessage;
-
-declare namespace __workerMain {
-  export let onmessage: (e: { data: any }) => void;
-  export function postMessage(data: any): void;
-  export function close(): void;
-  export const name: string;
-}
-
-/* eslint-enable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any */