Migrate server to ESM

Sorry for the very big commit that may lead to git log issues and merge
conflicts, but it's a major step forward:

 * Server can be faster at startup because imports() are async and we can
   easily lazy import big modules
 * Angular doesn't seem to support ES import (with .js extension), so we
   had to correctly organize peertube into a monorepo:
    * Use yarn workspace feature
    * Use typescript reference projects for dependencies
    * Shared projects have been moved into "packages", each one is now a
      node module (with a dedicated package.json/tsconfig.json)
    * server/tools have been moved into apps/ and is now a dedicated app
      bundled and published on NPM so users don't have to build peertube
      cli tools manually
    * server/tests have been moved into packages/ so we don't compile
      them every time we want to run the server
 * Use isolatedModule option:
   * Had to move from const enum to const
     (https://www.typescriptlang.org/docs/handbook/enums.html#objects-vs-enums)
   * Had to explictely specify "type" imports when used in decorators
 * Prefer tsx (that uses esbuild under the hood) instead of ts-node to
   load typescript files (tests with mocha or scripts):
     * To reduce test complexity as esbuild doesn't support decorator
       metadata, we only test server files that do not import server
       models
     * We still build tests files into js files for a faster CI
 * Remove unmaintained peertube CLI import script
 * Removed some barrels to speed up execution (less imports)

2 files changed, 66 insertions, 0 deletions

diff --git a/packages/tests/fixtures/peertube-plugin-test-video-constants/main.js b/packages/tests/fixtures/peertube-plugin-test-video-constants/main.js
new file mode 100644
index 000000000..06527bd35
--- /dev/null
+++ b/packages/tests/fixtures/peertube-plugin-test-video-constants/main.js
@@ -0,0 +1,46 @@
+async function register ({
+  videoCategoryManager,
+  videoLicenceManager,
+  videoLanguageManager,
+  videoPrivacyManager,
+  playlistPrivacyManager,
+  getRouter
+}) {
+  videoLanguageManager.addConstant('al_bhed', 'Al Bhed')
+  videoLanguageManager.addLanguage('al_bhed2', 'Al Bhed 2')
+  videoLanguageManager.addConstant('al_bhed3', 'Al Bhed 3')
+  videoLanguageManager.deleteConstant('en')
+  videoLanguageManager.deleteLanguage('fr')
+  videoLanguageManager.deleteConstant('al_bhed3')
+
+  videoCategoryManager.addCategory(42, 'Best category')
+  videoCategoryManager.addConstant(43, 'High best category')
+  videoCategoryManager.deleteConstant(1) // Music
+  videoCategoryManager.deleteCategory(2) // Films
+
+  videoLicenceManager.addLicence(42, 'Best licence')
+  videoLicenceManager.addConstant(43, 'High best licence')
+  videoLicenceManager.deleteConstant(1) // Attribution
+  videoLicenceManager.deleteConstant(7) // Public domain
+
+  videoPrivacyManager.deleteConstant(2)
+  videoPrivacyManager.deletePrivacy(2)
+  playlistPrivacyManager.deleteConstant(3)
+  playlistPrivacyManager.deletePlaylistPrivacy(3)
+
+  {
+    const router = getRouter()
+    router.get('/reset-categories', (req, res) => {
+      videoCategoryManager.resetConstants()
+
+      res.sendStatus(204)
+    })
+  }
+}
+
+async function unregister () {}
+
+module.exports = {
+  register,
+  unregister
+}
diff --git a/packages/tests/fixtures/peertube-plugin-test-video-constants/package.json b/packages/tests/fixtures/peertube-plugin-test-video-constants/package.json
new file mode 100644
index 000000000..0fcf39933
--- /dev/null
+++ b/packages/tests/fixtures/peertube-plugin-test-video-constants/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "peertube-plugin-test-video-constants",
+  "version": "0.0.1",
+  "description": "Plugin test video constants",
+  "engine": {
+    "peertube": ">=1.3.0"
+  },
+  "keywords": [
+    "peertube",
+    "plugin"
+  ],
+  "homepage": "https://github.com/Chocobozzz/PeerTube",
+  "author": "Chocobozzz",
+  "bugs": "https://github.com/Chocobozzz/PeerTube/issues",
+  "library": "./main.js",
+  "staticDirs": {},
+  "css": [],
+  "clientScripts": [],
+  "translations": {}
+}