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, 112 insertions, 0 deletions

diff --git a/packages/tests/fixtures/peertube-plugin-test-transcoding-one/main.js b/packages/tests/fixtures/peertube-plugin-test-transcoding-one/main.js
new file mode 100644
index 000000000..c4ae777f5
--- /dev/null
+++ b/packages/tests/fixtures/peertube-plugin-test-transcoding-one/main.js
@@ -0,0 +1,92 @@
+async function register ({ transcodingManager }) {
+
+  // Output options
+  {
+    {
+      const builder = () => {
+        return {
+          outputOptions: [
+            '-r 10'
+          ]
+        }
+      }
+
+      transcodingManager.addVODProfile('libx264', 'low-vod', builder)
+    }
+
+    {
+      const builder = (options) => {
+        return {
+          outputOptions: [
+            '-r:' + options.streamNum + ' 50'
+          ]
+        }
+      }
+
+      transcodingManager.addLiveProfile('libx264', 'high-live', builder)
+    }
+  }
+
+  // Input options
+  {
+    {
+      const builder = () => {
+        return {
+          inputOptions: [
+            '-r 5'
+          ]
+        }
+      }
+
+      transcodingManager.addVODProfile('libx264', 'input-options-vod', builder)
+    }
+
+    {
+      const builder = () => {
+        return {
+          inputOptions: [
+            '-r 50'
+          ]
+        }
+      }
+
+      transcodingManager.addLiveProfile('libx264', 'input-options-live', builder)
+    }
+  }
+
+  // Scale filters
+  {
+    {
+      const builder = () => {
+        return {
+          scaleFilter: {
+            name: 'Glomgold'
+          }
+        }
+      }
+
+      transcodingManager.addVODProfile('libx264', 'bad-scale-vod', builder)
+    }
+
+    {
+      const builder = () => {
+        return {
+          scaleFilter: {
+            name: 'Flintheart'
+          }
+        }
+      }
+
+      transcodingManager.addLiveProfile('libx264', 'bad-scale-live', builder)
+    }
+  }
+}
+
+async function unregister () {
+  return
+}
+
+module.exports = {
+  register,
+  unregister
+}
diff --git a/packages/tests/fixtures/peertube-plugin-test-transcoding-one/package.json b/packages/tests/fixtures/peertube-plugin-test-transcoding-one/package.json
new file mode 100644
index 000000000..bedbfa051
--- /dev/null
+++ b/packages/tests/fixtures/peertube-plugin-test-transcoding-one/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "peertube-plugin-test-transcoding-one",
+  "version": "0.0.1",
+  "description": "Plugin test transcoding 1",
+  "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": {}
+}