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)

packages/typescript-utils/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@peertube/peertube-typescript-utils",
+  "private": true,
+  "version": "0.0.0",
+  "main": "dist/index.js",
+  "files": [ "dist" ],
+  "exports": {
+    "types": "./dist/index.d.ts",
+    "peertube:tsx": "./src/index.ts",
+    "default": "./dist/index.js"
+  },
+  "type": "module",
+  "devDependencies": {},
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc -w"
+  },
+  "dependencies": {}
+}

packages/typescript-utils/src/index.ts

@@ -0,0 +1 @@
+export * from './types.js'

packages/typescript-utils/src/types.ts

@@ -0,0 +1,45 @@
+/* eslint-disable @typescript-eslint/array-type */
+
+export type FunctionPropertyNames<T> = {
+  [K in keyof T]: T[K] extends Function ? K : never
+}[keyof T]
+
+export type FunctionProperties<T> = Pick<T, FunctionPropertyNames<T>>
+
+export type AttributesOnly<T> = {
+  [K in keyof T]: T[K] extends Function ? never : T[K]
+}
+
+export type PickWith<T, KT extends keyof T, V> = {
+  [P in KT]: T[P] extends V ? V : never
+}
+
+export type PickWithOpt<T, KT extends keyof T, V> = {
+  [P in KT]?: T[P] extends V ? V : never
+}
+
+// https://github.com/krzkaczor/ts-essentials Rocks!
+export type DeepPartial<T> = {
+  [P in keyof T]?: T[P] extends Array<infer U>
+    ? Array<DeepPartial<U>>
+    : T[P] extends ReadonlyArray<infer U>
+      ? ReadonlyArray<DeepPartial<U>>
+      : DeepPartial<T[P]>
+}
+
+type Primitive = string | Function | number | boolean | symbol | undefined | null
+export type DeepOmitHelper<T, K extends keyof T> = {
+  [P in K]: // extra level of indirection needed to trigger homomorhic behavior
+  T[P] extends infer TP // distribute over unions
+    ? TP extends Primitive
+      ? TP // leave primitives and functions alone
+      : TP extends any[]
+        ? DeepOmitArray<TP, K> // Array special handling
+        : DeepOmit<TP, K>
+    : never
+}
+export type DeepOmit<T, K> = T extends Primitive ? T : DeepOmitHelper<T, Exclude<keyof T, K>>
+
+export type DeepOmitArray<T extends any[], K> = {
+  [P in keyof T]: DeepOmit<T[P], K>
+}

packages/typescript-utils/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "src",
+    "tsBuildInfoFile": "./dist/.tsbuildinfo"
+  }
+}

packages/typescript-utils/tsconfig.types.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../types-generator/dist/peertube-typescript-utils",
+    "tsBuildInfoFile": "../types-generator/dist/peertube-typescript-utils/.tsbuildinfo",
+    "stripInternal": true,
+    "removeComments": false,
+    "emitDeclarationOnly": true
+  }
+}