Hoist import declarations when transforming to commonjs/amd/umd module

[uhyo]

Fixes #16166.

So I was writing a TypeScript book and I wanted to demonstrate how the position of an import declaration does not matter, but then encountered #16166.

Here is a fix; this PR hoists all import declarations when transforming commonjs/amd/umd modules.

Although this is a breaking change, I see no concerns from TypeScript Team on that, looking at #16166 and #22178.

Example

console.log(BAR);
import {BAR} from './bar';

Current Behavior

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
console.log(bar_1.BAR);
const bar_1 = require("./bar");

New Behavior

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const bar_1 = require("./bar");
console.log(bar_1.BAR);

[sandersn]

Unfortunately, we never finished reviewing this PR. It is pretty old now, so I'm going to close it to reduce the number of open PRs.