lib: restructure cjs and esm loaders

Create `lib/internal/modules` and restructure the module loaders
to make the purpose of those files clearer.

Also make it clear in the code that the object exported by
`lib/internal/modules/cjs/loader.js` is `CJSModule` instead of the
ambiguous `Module`.

Before:

```
lib
├── ...
├── internal
│       ├── loaders
│       │     ├── CreateDynamicModule.js
│       │     ├── DefaultResolve.js
│       │     ├── Loader.js
│       │     ├── ModuleJob.js
│       │     ├── ModuleMap.js
│       │     └── Translators.js
│       └── module.js
└── module.js
```

After:

```
lib
├── ...
├── internal
│       ├── ...
│       └── modules
│              ├── cjs
│              │     ├── helpers.js
│              │     └── loader.js
│              └── esm
│                    ├── CreateDynamicModule.js
│                    ├── DefaultResolve.js
│                    ├── Loader.js
│                    ├── ModuleJob.js
│                    ├── ModuleMap.js
│                    └── Translators.js
└── module.js # deleted in this commit to work with git file mode
```

PR-URL: https://github.com/nodejs/node/pull/19177
Refs: https://github.com/nodejs/node/pull/19112
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/test/parallel/test-internal-modules-strip-shebang.js b/test/parallel/test-internal-modules-strip-shebang.js
index 93be3d4198..6c23848a96 100644
--- a/test/parallel/test-internal-modules-strip-shebang.js
+++ b/test/parallel/test-internal-modules-strip-shebang.js
@@ -3,7 +3,7 @@
 require('../common');
 
 const assert = require('assert');
-const stripShebang = require('internal/module').stripShebang;
+const stripShebang = require('internal/modules/cjs/helpers').stripShebang;
 
 [
   ['', ''],